Lua.luaL_error(luaState, "This is a custom error message.");
Lua.luaL_error(luaState, "Parameter %d is invalid.", paramIndex);The package library for UniLua is "UniLua", which contains all the functions and classes used by the UniLua interpreter. The luaL_error function is part of the Lua standard library, which is included in the UniLua package library.