No that's what I was saying, I can add rows. " The database value you're trying to insert does not exist: nextid".
I'm not sure exactly what I did to break it. I was trying to do edits with invalid formats, like characters in the hours field, so I was using the back button a lot. I think the nextid is trying to get the id of the row that I'm entering, but since the it's not able to insert it, it's failing?
I can test it more if you figure out what's wrong with inserts.