Hi,
Clean up means deleting the PlayMaker folder, while making sure you don't delete the playmakerglobals asset or templates if you have saved them inside the PlayMaker folder.
then you reimport, since you'll likely get errors because of PlayMaker missing, you'll need to manually install it, the package is in PlayMaker/Editor/Install
When there is a conflict between two assets, which happens sometimes, both publishers takes actions to fix their respective asset should it requires it.
So if you start with a fresh project and just PlayMaker, and add each of your required assets until you find the one breaking it, then we can proceed with checking exactly what's wrong with that asset, and fix it, either on our side, or on the asset side, or both.
I know this is a pain, but until I can reproduce this on my end, there is nothing more I can do, so make sure you go through that process, once you get the error again, get back to me, and I'll take over.
Bye,
Jean