That's a generic OS error and can mean many, many things. We need a lot more info to even begin guessing.

https://makemusic.zendesk.com/hc/en-us/community/posts/215729367-General-Discussion-House-Rules 

If you do a search, you'll see 

738 results for "ID = -2"

I also get this message, and I am unable to use copy and paste.

Elisabeth you latched on to a 2 year old post. Probably better to start you own new thread. I am not a Mac user but we have some great Mac guys here so I am sure they can help.