First, hello and welcome to the forum.
Second, I think we are going to need just a little bit more of a hint here. What were you doing (or trying to do) that triggered that error message? We have too much to look at without some hints on how to produce that error. Give us some context.
Third, since it is your first post, you clearly would not know our preferences. The "Introduction" forum isn't meant for problems. It isn't that big of a deal because new folks do this often. But you should post problems in the problem forum. No penalties involved, but we might move your thread to some other place.