Hi.
i can see that you moved playmaker in a different folder.
That's the reason why it gives issues.
Playmaker folder should stay in the main asset folder.
You might get issues with other assets as well, doing this.
a better way to manage is to make a folder and call it for example _My Project Files.
and store things that you use in your project there (like Scenes/Sprites/Mehes/Materials/Prefabs/Etc)
do not place imported assets into this folder (like Playmaker / other tools)