You need to enable "Python exceptions" in the CivilizationIV.ini file located in \My Documents\My Games\Beyond the Sword\
My best guess is that you're using the mod-mod with the wrong version of RFC though.
My RFC version is up to date. It's RFC 1.187 for BtS, just downloaded yesterday. I use Varietas Dialect for RFC, but it doesn't do anything python related. With Varietas Dialect I'm unable to read what the python errors are because civ ctds and the windows message appears saying:
"Sid Meier's Civilization 4: Beyond The Sword Has Stopped Working.
A problem caused the program to stop working correctly. Windows will close the program and notify you if a solution is available."
So I tried it with normal RFC 1.187 for BtS and received the following python errors
File "CvEventInterface", line 23, in onEvent
File "CvEventManager", line 108, in handleEvent
File "CvEventManager", line 119, in _handleDefaultEvent
File "CvEventManager", line 555, in onBeginPlayerTurn
File "RiseAndFall", line 371, in getDeleteMode
Name Error: global name "StoredData" is not defined
Any ideas?