see #18
you don't have ancient wonders DLC, the mod reference to wonders in that and cause a bug
will fix in next version
Hmm ok... just curious, was that an oversight, or did you actually expect most people to have that particular DLC? (Was it included in most copies of the original Civ 5 bought via Steam? (I got mine at retail so I wouldn't know)? )
I mean hell I don't have a big problem picking up a $5 DLC, especially if it really adds something worthwhile *or* makes using MODs much easier... after all the only reason I got Brave New World was because the MOD scene now more or less requires it... but on the other hand all the major Civ 5 MODs I've tried (Nights, Communitas, Hulfgars) didn't require any DLCs...