I'm not exactly sure what is causing the crash but I'm investigating it.
To be more precise, we need to know what causes this:
GAME -- EntityFactory failed to create entity due to invalid parameters
-- FATAL EXIT --
entityfactoryimp.c/299:!
--stack trace--
Further information would be great, such as:
Are you using the reward faction for the British?
Does this happen on more than one map?