Thanks for your help.
That's what I did, I first updated playmaker. Also removed playmaker and installed it again from Assets/PlayMaker/Editor/Install and copied the globals, templates and custom actions.
Unfortunately after adding the custom actions I'm still getting the error.
Maybe should I try to start an empty new project, adding playmaker and copy the scenes and scripts to the new project?
Edit: I started a new empty project, imported playmaker from the assetstore, then copied the scenes and scripts. But after adding the custom actions, the error still pops up. Can it maybe have something to do with the custom actions?
I added
using Bounds = UnityEngine.Bounds;
Now the error is gone
