Re: Log error numerous "Building DB error"
The error messages will not have anything to do with your crash - EBII uses multiple upgrade possibilities in their buildings as well as the global 'all factions' conditions in the upper level of the buildings which may cause these messages.
Example: Building DB error - faction f_hayasdan has gap in building prior to stock_past2
This building uses the 'all' condition and is an upgrade from stock_two ('all' again) as well as horse_one which has a specific faction list as condition where hayasdan isn't listed.
As to your log - not sure why there are multiple 'Battle Loading' log entries over a span of 12 seconds before the end of the log without a specific crash message. If the crash persist you may have to change to a trace log to get more details.