How to fix error "too many CAttackAbil abilities"?

when i using campaign and Multi void dependencies these error showing up
“too many CAttackAbil abilities for (unit name)”

The unit type’s parent cannot have abilities on it. That is the only solution have I found and I don’t know why that is. Also, if the unit type is has morph ability or morph placement abiliity both types must use the same Attack ability

Cause you combine Multi and Void, this causes a conflicts of data. There’s only the ALFX way if you absolutely want to browse campaign content into your multi-mod. Yes… you can fix the too many attack abil problem, but that’s only the tip of the iceberg.

As ScrappyTank puts it, you can indeed check for units with morph abilities, taking a look at morphed unit if they have an alternate attack ability. Usually, when all morph/unmorphed versions use the same attack ability ID, this error doesn’t occur.