undefined symbol: luaopen_LuaXml - lua

Question

I had installed luaxml module using luarocks. I had used the luaxml to call in a lua script. But getting an error
Lua script:
xml = require("LuaXml");
local xobj = xml.eval('<Cmd Message="Hello"/>');
session:consoleLog("INFO","The message in the XML is "..xobj["Message"].."\n");
Error:
mod_lua.cpp:203 error loading module 'LuaXml' from file '/usr/local/lib/lua
/5.2/LuaXML_lib.so': /usr/local/lib/lua/5.2/LuaXML_lib.so: undefined symbol:
luaopen_LuaXml
stack traceback:
[C]: ?
[C]: in function 'require'
I had seen the concept of add libraries to Lua dynamically but i couldn't understand. Can anyone help me out. Briefly so that how to link the core module luaxml with the script.
Another question how can i test whether the installed module luaxml through luarocks is installed or not.

Answer 1

The output of nm -g /usr/lib/lua/5.1/LuaXML_lib.so tells us that this file exports luaopen_LuaXML_lib, not luaopen_LuaXML, which is what require("LuaXml") needs.
Now I don't know why require("LuaXml") is opening /usr/lib/lua/5.1/LuaXML_lib.so. It should be looking for LuaXM.so or LuaXml.lua, in this order.
LuaXML works by loading LuaXml.lua, which does require("LuaXML_lib"). This then will load LuaXML_lib.so.
Perhaps there is a mistake in your LUA_CPATH or package.cpath.