Ya. I looked at your save. Looks like you don't have any other ERM enemy installed.
The "Enable Biter" option wasn't designed to disabled when you don't have any other ERM races installed. It attempted to disable all units in the original "enemy" force hence it crashed. The option was designed to mix other ERM enemies without the base game biters.
I can fix the start up crash. However, the mod may have other unknow bugs from other features, as none of them were designed with this scenario in mind. (disable biter without any other ERM enemies). This fix will probably like open a can of worms.