Error Messages

You probably had some error messages today. What error messages did you have?  How did you solve the error message?  Is is common to get error messages as a coder?  Why might a programmer "like" or benefit from error messages?

I did not experience any error messages since the project was fairly simple especially since I have used Javascript frequently in the past and am familiar with the syntax. Some common errors however that I have received in the past or my peers could have received would be mismatching ids or misspelling ids when you call things in your code. A programmer like myself would benefit from receiving error messages because it teaches the programmer how to deal with and solve problems in their code.