Note: This was originally posted by an inactive account. Content was preserved by moving under an admin account.
Originally posted by: ejonesSeeing the version you are using helps. We were hoping the answer was that the license you have installed doesn't allow library nodes. But since you aren't using the public license that can't be the answer. There was also an issue in some 4.x version that I never fully understood and might produce that type of error. Whatever that was has been fixed before 5.x.
So, here is what I think it is. Somehow the graph is referencing its self as a library graph. To check for this go to Graph -> "Edit Base Libraries... " If the name of the graph appears as a library graph then this is the problem. Before fixing it, you should make a backup of the graph in case the fix doesn't work. To fix it, delete that entry in the "Base Libraries" window and then save and exit. Hopefully when you open the graph you do not get that error message.
An alternative fix for the same issue, which I use but can't recommend. Because Lavastorm cannot condone it and you might easily do something to mess things up further. Open the BRG file in a text editor, find the line of code which is near the top that shows the graph is referencing itself as a base library, delete that line, and then save the BRG.