Got it working without the lang file

. Thanks for the help fysiks.
Code:
/* Plugin generated by AMXX-Studio */
#include <amxmodx>
#include <amxmisc>
#include <celltrie>
#define PLUGIN "logging"
#define VERSION "1.0"
#define AUTHOR "Server Owner"
new Trie:gSteamIDTrie
new gszFile[64]
public plugin_init() {
register_plugin(PLUGIN, VERSION, AUTHOR)
register_logevent("round_start", 2, "1=Round_Start")
}
public round_start()
{
new info[36]
new players[32], player, num
new authid[32], name[32]
gSteamIDTrie=TrieCreate()
get_localinfo( "amxx_configsdir", gszFile, 63 )
new const text[64]="Server Player Log File"
new const logs[64]="addons/amxmodx/configs/logs.txt"
if(!file_exists(logs))
write_file(logs, text)
new file=fopen( logs, "rt" )
while( !feof(file) )
{
fgets( file, info, charsmax(info) )
trim(info)
TrieSetCell(gSteamIDTrie, info, 1)
}
fclose(file)
get_players(players, num)
for( new i; i<num; i++ )
{
player=players[i]
get_user_authid( player, authid, charsmax(authid) )
get_user_name( player, name, 31 )
if( !TrieKeyExists( gSteamIDTrie, authid ) )
{
write_file( logs, name )
write_file( logs, authid )
client_print(0, print_chat, "%s has never played in this server before, please welcome him!", name)
}
}
}