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Some of my projects have error icons on the packages but there are no compile errors in the package (that I can find). In general when I have seen an error icon, I can traverse the source tree until the source file with the error is found. In this case none of the source files have errors in them. Hovering over the icon doesn't indicate anything either.
I created a new class interface who's methods throw exceptions that don't yet exist. I then used the lightbulb icon to create the missing exception classes. After saving and closing all of the new exception classes I came back to the main interface class and saw the green square at the top right indicating that there are no problems. However, the package tree in the projects tab shows the red ! icon all the way down to the interface class file. I closed the interface class, and it did not ask me to save because there were no changes. The red ! icons immediately disappeared from the project tree.
*** This issue has been marked as a duplicate of 104665 ***