Thanks, for your reply MattCaspermeyer.
I have mainly created new units and items and also changed several existing items to affect new units as well (e.g. item affecting archers will affect the new archer unit I have created). Below are the upload links for the master file and my nexus mod (both should be put somewhere in game folder). So far I had no other issues after adding the mod and continuing from existing save. If you could find the issue I would appreciate it.
http://speedy.sh/bZzjM/KBMaster-2.2.2-for-a12.kfs
http://speedy.sh/G5ubH/mod-a12-Maste...-convertor.kfs