Thread:Extension talk:Scribunto/Lua error in Module:Fallback at line 73: attempt to index a nil value.

what is this problem: ??? I have imported modules that are required, still does not work.

Backtrace:

(tail call): ? Module:Fallback:73: in function "fallbackpage" Module:Fallback:99: in function "chunk" mw.lua:567: ? (tail call): ? [C]: in function "xpcall" MWServer.lua:87: in function "handleCall" MWServer.lua:301: in function "dispatch" MWServer.lua:40: in function "execute" mw_main.lua:7: in main chunk [C]: ?