diff --git a/Makefile b/Makefile
index 45b4254c..d67e9852 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,8 @@
 .PHONY : all clean 
 
-CFLAGS = -g -Wall
+CFLAGS = -g -Wall 
 SHARED = -fPIC --shared
+LUALIB = -llua
 
 all : \
   skynet \
@@ -31,8 +32,9 @@ skynet : \
   skynet-src/skynet_harbor.c \
   skynet-src/skynet_multicast.c \
   skynet-src/skynet_group.c \
-  skynet-src/skynet_env.c
-	gcc $(CFLAGS) -Wl,-E -o $@ $^ -Iskynet-src -lpthread -ldl -lrt -Wl,-E -llua -lm
+  skynet-src/skynet_env.c \
+  luacompat/compat52.c
+	gcc $(CFLAGS) -Iluacompat -Wl,-E -o $@ $^ -Iskynet-src -lpthread -ldl -lrt -Wl,-E $(LUALIB) -lm
 
 luaclib:
 	mkdir luaclib
@@ -53,13 +55,13 @@ service/logger.so : skynet-src/skynet_logger.c
 	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src
 
 service/snlua.so : service-src/service_lua.c
-	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src
+	gcc $(CFLAGS) $(SHARED) -Iluacompat $^ -o $@ -Iskynet-src
 
 service/gate.so : gate/mread.c gate/ringbuffer.c gate/main.c
 	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Igate -Iskynet-src
 
 luaclib/skynet.so : lualib-src/lua-skynet.c lualib-src/lua-seri.c lualib-src/lua-remoteobj.c | luaclib
-	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src
+	gcc $(CFLAGS) $(SHARED) -Iluacompat $^ -o $@ -Iskynet-src
 
 service/client.so : service-src/service_client.c
 	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src
@@ -68,10 +70,10 @@ service/connection.so : connection/connection.c connection/main.c
 	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src -Iconnection
 
 luaclib/socket.so : connection/lua-socket.c | luaclib
-	gcc $(CFLAGS) $(SHARED) $^ -o $@ -Iskynet-src -Iconnection
+	gcc $(CFLAGS) $(SHARED) -Iluacompat $^ -o $@ -Iskynet-src -Iconnection
 
 luaclib/int64.so : lua-int64/int64.c | luaclib
-	gcc $(CFLAGS) $(SHARED) -O2 $^ -o $@ 
+	gcc $(CFLAGS) $(SHARED) -Iluacompat -O2 $^ -o $@ 
 
 client : client-src/client.c
 	gcc $(CFLAGS) $^ -o $@ -lpthread
diff --git a/connection/lua-socket.c b/connection/lua-socket.c
index 1b8895cc..bdad5f61 100644
--- a/connection/lua-socket.c
+++ b/connection/lua-socket.c
@@ -1,5 +1,7 @@
 #include "skynet.h"
 
+#include "luacompat52.h"
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/lua-int64/int64.c b/lua-int64/int64.c
index 6d72c1bc..e1a07e15 100644
--- a/lua-int64/int64.c
+++ b/lua-int64/int64.c
@@ -1,3 +1,4 @@
+#include "luacompat52.h"
 #include <lua.h>
 #include <lauxlib.h>
 #include <stdint.h>
@@ -198,7 +199,7 @@ tostring(lua_State *L) {
 	uintptr_t n = (uintptr_t)lua_touserdata(L,1);
 	if (lua_gettop(L) == 1) {
 		luaL_Buffer b;
-		luaL_buffinitsize(L , &b , 28);
+		luaL_buffinit(L , &b);
 		luaL_addstring(&b, "int64: 0x");
 		int i;
 		bool strip = true;
@@ -230,7 +231,7 @@ tostring(lua_State *L) {
 		case 10: {
 			int64_t dec = (int64_t)n;
 			luaL_Buffer b;
-			luaL_buffinitsize(L , &b , 28);
+			luaL_buffinit(L , &b);
 			if (dec<0) {
 				luaL_addchar(&b, '-');
 				dec = -dec;
diff --git a/luacompat/compat52.c b/luacompat/compat52.c
new file mode 100644
index 00000000..d59d247c
--- /dev/null
+++ b/luacompat/compat52.c
@@ -0,0 +1,371 @@
+#include "luacompat52.h"
+#include <assert.h>
+
+#if (LUA_VERSION_NUM == 501)
+
+LUALIB_API void 
+luaL_init(lua_State *L) {
+	lua_pushglobaltable(L);
+	lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
+	int mt = lua_pushthread(L);
+	if (mt == 0) {
+		luaL_error(L, "luaL_init must be call in mainthread");
+	}
+	lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_MAINTHREAD);
+}
+
+LUA_API int
+lua_absindex(lua_State *L, int idx) {
+	if (idx > 0 || idx <= LUA_REGISTRYINDEX)
+		return idx;
+	else {
+		return lua_gettop(L) + idx + 1;
+	}
+}
+
+LUA_API int 
+lua_compare(lua_State *L, int idx1, int idx2, int op) {
+	switch(op) {
+	case LUA_OPEQ:
+		return lua_equal(L,idx1,idx2);
+	case LUA_OPLT:
+		return lua_lessthan(L, idx1, idx2);
+	case LUA_OPLE:
+		return !lua_lessthan(L, idx2, idx1);
+	}
+	assert(0);
+	return 0;
+}
+
+LUA_API void
+lua_copy(lua_State *L, int fromidx, int toidx) {
+	lua_pushvalue(L, fromidx);
+	lua_replace(L, toidx);
+}
+
+LUA_API void
+lua_getuservalue(lua_State *L, int idx) {
+	lua_getfenv(L, idx);
+}
+
+LUA_API void
+lua_setuservalue(lua_State *L, int idx) {
+	lua_setfenv(L, idx);
+}
+
+LUA_API void 
+lua_len(lua_State *L, int idx) {
+	int hasmeta = luaL_callmeta (L, idx, "__len");
+	if (hasmeta == 0) {
+		size_t sz = lua_objlen(L, idx);
+		lua_pushnumber(L, sz);
+	}
+}
+
+LUA_API void
+lua_rawgetp(lua_State *L, int idx, const void *p) {
+	idx = lua_absindex(L, idx);
+	lua_pushlightuserdata(L, (void *)p);
+	lua_rawget(L, idx);
+}
+
+LUA_API void
+lua_rawsetp(lua_State *L, int idx, const void *p) {
+	idx = lua_absindex(L, idx);
+	lua_pushlightuserdata(L, (void *)p);
+	lua_insert(L, -2);
+	lua_rawset(L, idx);
+}
+
+LUA_API lua_Number 
+lua_tonumberx(lua_State *L, int index, int *isnum) {
+	lua_Number n = lua_tonumber(L, index);
+	if (isnum) {
+		if (n != 0) {
+			*isnum = 1;
+		} else {
+			switch (lua_type(L, index)) {
+			case LUA_TNUMBER:
+				*isnum = 1;
+				break;
+			case LUA_TSTRING: {
+				size_t sz = 0;
+				const char * number = lua_tolstring(L, index, &sz);
+				if ((sz == 1 && number[0] == '0') || 
+					(sz == 3 && number[0] == '0' && (number[1] == 'x' || number[1] == 'X') && number[2] == '0')) {
+					*isnum = 1;
+				} else {
+					*isnum = 0;
+				}
+				break;
+			}
+			default:
+				*isnum = 0;
+				break;
+			}
+		}
+	} 
+	return n;
+}
+
+LUA_API lua_Unsigned
+lua_tounsignedx(lua_State *L, int idx, int *isnum) {
+	lua_Number n = lua_tonumberx(L, idx, isnum);
+	return (lua_Unsigned)n;
+}
+
+LUA_API lua_Integer
+lua_tointegerx(lua_State *L, int idx, int *isnum) {
+	lua_Number n = lua_tonumberx(L, idx, isnum);
+	return (lua_Integer)n;
+}
+
+LUA_API const lua_Number *
+lua_version(lua_State *L) {
+	static const lua_Number version = LUA_VERSION_NUM;
+	return &version;
+}
+
+LUALIB_API void 
+luaL_checkversion_ (lua_State *L, lua_Number ver) {
+	const lua_Number *v = lua_version(L);
+	if (*v != ver)
+		luaL_error(L, "version mismatch: app. needs %f, Lua core provides %f", ver, *v);
+  /* check conversions number -> integer types */
+  lua_pushnumber(L, -(lua_Number)0x1234);
+  if (lua_tointeger(L, -1) != -0x1234 ||
+      lua_tounsigned(L, -1) != (lua_Unsigned)-0x1234)
+    luaL_error(L, "bad conversion number->int;"
+                  " must recompile Lua with proper settings");
+  lua_pop(L, 1);
+}
+
+LUALIB_API int 
+luaL_len (lua_State *L, int idx) {
+  int l;
+  int isnum;
+  lua_len(L, idx);
+  l = (int)lua_tointegerx(L, -1, &isnum);
+  if (!isnum)
+    luaL_error(L, "object length is not a number");
+  lua_pop(L, 1);  /* remove object */
+  return l;
+}
+
+LUALIB_API int 
+luaL_getsubtable (lua_State *L, int idx, const char *fname) {
+  lua_getfield(L, idx, fname);
+  if (lua_istable(L, -1)) return 1;  /* table already there */
+  else {
+    lua_pop(L, 1);  /* remove previous result */
+    idx = lua_absindex(L, idx);
+    lua_newtable(L);
+    lua_pushvalue(L, -1);  /* copy to be left at top */
+    lua_setfield(L, idx, fname);  /* assign new table to field */
+    return 0;  /* false, because did not find table there */
+  }
+}
+
+LUALIB_API lua_Unsigned 
+luaL_checkunsigned (lua_State *L, int narg) {
+  int isnum;
+  lua_Unsigned d = lua_tounsignedx(L, narg, &isnum);
+  if (!isnum) {
+	return luaL_error(L, "arg %d is not a unsigned", narg);
+  }
+  return d;
+}
+
+LUALIB_API lua_Unsigned 
+luaL_optunsigned (lua_State *L, int narg, lua_Unsigned def) {
+  return luaL_opt(L, luaL_checkunsigned, narg, def);
+}
+
+LUALIB_API void 
+luaL_pushresultsize (luaL_Buffer *B, size_t sz) {
+  luaL_addsize(B, sz);
+  luaL_pushresult(B);
+}
+
+LUALIB_API void 
+luaL_requiref (lua_State *L, const char *modname,
+                               lua_CFunction openf, int glb) {
+  lua_pushcfunction(L, openf);
+  lua_pushstring(L, modname);  /* argument to open function */
+  lua_call(L, 1, 1);  /* open module */
+  luaL_getsubtable(L, LUA_REGISTRYINDEX, "_LOADED");
+  lua_pushvalue(L, -2);  /* make copy of module (call result) */
+  lua_setfield(L, -2, modname);  /* _LOADED[modname] = module */
+  lua_pop(L, 1);  /* remove _LOADED table */
+  if (glb) {
+    lua_pushvalue(L, -1);  /* copy of 'mod' */
+    lua_setglobal(L, modname);  /* _G[modname] = module */
+  }
+}
+
+LUALIB_API void 
+luaL_setfuncs (lua_State *L, const luaL_Reg *l, int nup) {
+  luaL_checkversion(L);
+  luaL_checkstack(L, nup, "too many upvalues");
+  for (; l->name != NULL; l++) {  /* fill the table with given functions */
+    int i;
+    for (i = 0; i < nup; i++)  /* copy upvalues to the top */
+      lua_pushvalue(L, -nup);
+    lua_pushcclosure(L, l->func, nup);  /* closure with those upvalues */
+    lua_setfield(L, -(nup + 2), l->name);
+  }
+  lua_pop(L, nup);  /* remove upvalues */
+}
+
+LUALIB_API void 
+luaL_setmetatable (lua_State *L, const char *tname) {
+  luaL_getmetatable(L, tname);
+  lua_setmetatable(L, -2);
+}
+
+LUALIB_API const char *
+luaL_tolstring (lua_State *L, int idx, size_t *len) {
+  if (!luaL_callmeta(L, idx, "__tostring")) {  /* no metafield? */
+    switch (lua_type(L, idx)) {
+      case LUA_TNUMBER:
+      case LUA_TSTRING:
+        lua_pushvalue(L, idx);
+        break;
+      case LUA_TBOOLEAN:
+        lua_pushstring(L, (lua_toboolean(L, idx) ? "true" : "false"));
+        break;
+      case LUA_TNIL:
+        lua_pushliteral(L, "nil");
+        break;
+      default:
+        lua_pushfstring(L, "%s: %p", luaL_typename(L, idx),
+                                            lua_topointer(L, idx));
+        break;
+    }
+  }
+  return lua_tolstring(L, -1, len);
+}
+
+/*
+** {======================================================
+** Traceback
+** =======================================================
+*/
+
+
+#define LEVELS1	12	/* size of the first part of the stack */
+#define LEVELS2	10	/* size of the second part of the stack */
+
+
+
+/*
+** search for 'objidx' in table at index -1.
+** return 1 + string at top if find a good name.
+*/
+static int findfield (lua_State *L, int objidx, int level) {
+  if (level == 0 || !lua_istable(L, -1))
+    return 0;  /* not found */
+  lua_pushnil(L);  /* start 'next' loop */
+  while (lua_next(L, -2)) {  /* for each pair in table */
+    if (lua_type(L, -2) == LUA_TSTRING) {  /* ignore non-string keys */
+      if (lua_rawequal(L, objidx, -1)) {  /* found object? */
+        lua_pop(L, 1);  /* remove value (but keep name) */
+        return 1;
+      }
+      else if (findfield(L, objidx, level - 1)) {  /* try recursively */
+        lua_remove(L, -2);  /* remove table (but keep name) */
+        lua_pushliteral(L, ".");
+        lua_insert(L, -2);  /* place '.' between the two names */
+        lua_concat(L, 3);
+        return 1;
+      }
+    }
+    lua_pop(L, 1);  /* remove value */
+  }
+  return 0;  /* not found */
+}
+
+
+static int pushglobalfuncname (lua_State *L, lua_Debug *ar) {
+  int top = lua_gettop(L);
+  lua_getinfo(L, "f", ar);  /* push function */
+  lua_pushglobaltable(L);
+  if (findfield(L, top + 1, 2)) {
+    lua_copy(L, -1, top + 1);  /* move name to proper place */
+    lua_pop(L, 2);  /* remove pushed values */
+    return 1;
+  }
+  else {
+    lua_settop(L, top);  /* remove function and global table */
+    return 0;
+  }
+}
+
+static void pushfuncname (lua_State *L, lua_Debug *ar) {
+  if (*ar->namewhat != '\0')  /* is there a name? */
+    lua_pushfstring(L, "function " LUA_QS, ar->name);
+  else if (*ar->what == 'm')  /* main? */
+      lua_pushfstring(L, "main chunk");
+  else if (*ar->what == 'C') {
+    if (pushglobalfuncname(L, ar)) {
+      lua_pushfstring(L, "function " LUA_QS, lua_tostring(L, -1));
+      lua_remove(L, -2);  /* remove name */
+    }
+    else
+      lua_pushliteral(L, "?");
+  }
+  else
+    lua_pushfstring(L, "function <%s:%d>", ar->short_src, ar->linedefined);
+}
+
+
+static int countlevels (lua_State *L) {
+  lua_Debug ar;
+  int li = 1, le = 1;
+  /* find an upper bound */
+  while (lua_getstack(L, le, &ar)) { li = le; le *= 2; }
+  /* do a binary search */
+  while (li < le) {
+    int m = (li + le)/2;
+    if (lua_getstack(L, m, &ar)) li = m + 1;
+    else le = m;
+  }
+  return le - 1;
+}
+
+
+LUALIB_API void luaL_traceback (lua_State *L, lua_State *L1,
+                                const char *msg, int level) {
+  lua_Debug ar;
+  int top = lua_gettop(L);
+  int numlevels = countlevels(L1);
+  int mark = (numlevels > LEVELS1 + LEVELS2) ? LEVELS1 : 0;
+  if (msg) lua_pushfstring(L, "%s\n", msg);
+  lua_pushliteral(L, "stack traceback:");
+  while (lua_getstack(L1, level++, &ar)) {
+    if (level == mark) {  /* too many levels? */
+      lua_pushliteral(L, "\n\t...");  /* add a '...' */
+      level = numlevels - LEVELS2;  /* and skip to last ones */
+    }
+    else {
+      lua_getinfo(L1, "Slnt", &ar);
+      lua_pushfstring(L, "\n\t%s:", ar.short_src);
+      if (ar.currentline > 0)
+        lua_pushfstring(L, "%d:", ar.currentline);
+      lua_pushliteral(L, " in ");
+      pushfuncname(L, &ar);
+      lua_concat(L, lua_gettop(L) - top);
+    }
+  }
+  lua_concat(L, lua_gettop(L) - top);
+}
+
+/* }====================================================== */
+
+#else
+
+LUALIB_API void 
+luaL_init(lua_State *L) {
+}
+
+#endif
diff --git a/luacompat/luacompat52.h b/luacompat/luacompat52.h
new file mode 100644
index 00000000..9bc9b4ff
--- /dev/null
+++ b/luacompat/luacompat52.h
@@ -0,0 +1,88 @@
+#ifndef LUA_COMPAT_52_H
+#define LUA_COMPAT_52_H
+
+#include "lua.h"
+#include "lauxlib.h"
+
+LUALIB_API void (luaL_init)(lua_State *L);
+
+#if (LUA_VERSION_NUM == 501)
+
+#include <stddef.h>
+
+#define LUA_OK 0
+#define LUA_ERRGCMM	6
+
+/* predefined values in the registry */
+#define LUA_RIDX_MAINTHREAD	1
+#define LUA_RIDX_GLOBALS	2
+#define LUA_RIDX_LAST		LUA_RIDX_GLOBALS
+
+#define LUA_UNSIGNED	unsigned int
+typedef LUA_UNSIGNED lua_Unsigned;
+
+LUA_API int   (lua_absindex) (lua_State *L, int idx);
+
+#define LUA_OPEQ	0
+#define LUA_OPLT	1
+#define LUA_OPLE	2
+
+LUA_API int   (lua_compare) (lua_State *L, int idx1, int idx2, int op);
+
+LUA_API void  (lua_copy) (lua_State *L, int fromidx, int toidx);
+
+LUA_API void  (lua_getuservalue) (lua_State *L, int idx);
+LUA_API void  (lua_setuservalue) (lua_State *L, int idx);
+
+LUA_API void  (lua_len)    (lua_State *L, int idx);
+
+#define lua_rawlen(L,idx) lua_objlen(L,idx)
+
+LUA_API void  (lua_rawgetp) (lua_State *L, int idx, const void *p);
+LUA_API void  (lua_rawsetp) (lua_State *L, int idx, const void *p);
+
+#define lua_tounsigned(L,i)	lua_tounsignedx(L,i,NULL)
+LUA_API lua_Unsigned    (lua_tounsignedx) (lua_State *L, int idx, int *isnum);
+
+LUA_API lua_Integer     (lua_tointegerx) (lua_State *L, int idx, int *isnum);
+LUA_API lua_Number (lua_tonumberx) (lua_State *L, int index, int *isnum);
+
+LUA_API const lua_Number *(lua_version) (lua_State *L);
+
+#define lua_pushglobaltable(L)  lua_pushvalue(L, LUA_GLOBALSINDEX)
+
+LUALIB_API lua_Unsigned (luaL_checkunsigned) (lua_State *L, int numArg);
+
+LUALIB_API void (luaL_checkversion_) (lua_State *L, lua_Number ver);
+#define luaL_checkversion(L)	luaL_checkversion_(L, LUA_VERSION_NUM)
+
+LUALIB_API int (luaL_getsubtable) (lua_State *L, int idx, const char *fname);
+LUALIB_API int (luaL_len) (lua_State *L, int idx);
+
+#define luaL_newlibtable(L,l)	\
+  lua_createtable(L, 0, sizeof(l)/sizeof((l)[0]) - 1)
+
+#define luaL_newlib(L,l)	(luaL_newlibtable(L,l), luaL_setfuncs(L,l,0))
+
+#define luaL_opt(L,f,n,d)	(lua_isnoneornil(L,(n)) ? (d) : f(L,(n)))
+
+LUALIB_API lua_Unsigned (luaL_optunsigned) (lua_State *L, int numArg,
+                                            lua_Unsigned def);
+
+LUALIB_API void (luaL_pushresultsize) (luaL_Buffer *B, size_t sz);
+
+LUALIB_API void (luaL_requiref) (lua_State *L, const char *modname,
+                                 lua_CFunction openf, int glb);
+
+LUALIB_API void (luaL_setfuncs) (lua_State *L, const luaL_Reg *l, int nup);
+
+LUALIB_API void  (luaL_setmetatable) (lua_State *L, const char *tname);
+
+LUALIB_API const char *(luaL_tolstring) (lua_State *L, int idx, size_t *len);
+
+LUALIB_API void (luaL_traceback) (lua_State *L, lua_State *L1,
+                                  const char *msg, int level);
+
+#endif
+
+#endif
diff --git a/lualib-src/lua-remoteobj.c b/lualib-src/lua-remoteobj.c
index 5a551173..21610734 100644
--- a/lualib-src/lua-remoteobj.c
+++ b/lualib-src/lua-remoteobj.c
@@ -1,5 +1,6 @@
 #include <lua.h>
 #include <lauxlib.h>
+#include "luacompat52.h"
 
 #include <stdint.h>
 #include <stdlib.h>
diff --git a/lualib-src/lua-seri.c b/lualib-src/lua-seri.c
index 86924ba8..236d7930 100644
--- a/lualib-src/lua-seri.c
+++ b/lualib-src/lua-seri.c
@@ -2,6 +2,7 @@
   https://github.com/cloudwu/lua-serialize
  */
 
+#include "luacompat52.h"
 #include <lua.h>
 #include <lauxlib.h>
 #include <stdlib.h>
diff --git a/lualib-src/lua-skynet.c b/lualib-src/lua-skynet.c
index 61e3b5c6..6c42c98f 100644
--- a/lualib-src/lua-skynet.c
+++ b/lualib-src/lua-skynet.c
@@ -1,6 +1,8 @@
 #include "skynet.h"
 #include "lua-seri.h"
 
+#include "luacompat52.h"
+
 #include <lua.h>
 #include <lauxlib.h>
 #include <stdlib.h>
diff --git a/service-src/service_lua.c b/service-src/service_lua.c
index e3b3f8de..000a08d3 100644
--- a/service-src/service_lua.c
+++ b/service-src/service_lua.c
@@ -3,6 +3,7 @@
 #include <lua.h>
 #include <lualib.h>
 #include <lauxlib.h>
+#include "luacompat52.h"
 
 #include <string.h>
 #include <stdlib.h>
@@ -90,6 +91,7 @@ traceback (lua_State *L) {
 
 int
 snlua_init(lua_State *L, struct skynet_context *ctx, const char * args) {
+	luaL_init(L);
 	lua_gc(L, LUA_GCSTOP, 0);
 	luaL_openlibs(L);
 	lua_pushlightuserdata(L, ctx);
diff --git a/skynet-src/skynet_main.c b/skynet-src/skynet_main.c
index 294bca3f..37272de1 100644
--- a/skynet-src/skynet_main.c
+++ b/skynet-src/skynet_main.c
@@ -1,5 +1,6 @@
 #include "skynet_imp.h"
 #include "skynet_env.h"
+#include "luacompat52.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -45,7 +46,7 @@ optstring(const char *key,const char * opt) {
 
 static void
 _init_env(lua_State *L) {
-	lua_rawgeti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
+	lua_pushglobaltable(L);
 	lua_pushnil(L);  /* first key */
 	while (lua_next(L, -2) != 0) {
 		int keyt = lua_type(L, -2);
@@ -85,6 +86,7 @@ main(int argc, char *argv[]) {
 	lua_close(L);
 
 	L = luaL_newstate();
+	luaL_init(L);
 
 	int err = luaL_dofile(L, config_file);
 	if (err) {