Thanks for the log.
Hmm. I see what is the problem now. The Mouse Event node right now requires a MainCamera to store “Hit Info” in case you require them (“info” output port), thus a Camera with the “MainCamera” tag set. As I understand though, there must be no such “MainCamera” in your scene.
I have just fixed the error to check for if the MainCamera is null and attached the package for you here. The events will work fine, but the “Info” output port will not contain any data if there is no MainCamera.
If however you set your camera’s tag to “MainCamera”, the “Info” output port will also contain useful data.
In both cases, the events will though now work 🙂
Please let me know things work for you after you import the attached package.
Thanks.