MakeJmlrBookGUI tries to detect common problems encountered when using the jmlrbook class. The navigation panel shows the problem papers in red to easily identify them. As mentioned at the end of the previous section, some of these error messages have a link next to them to provide further details or recommendations.
Try to fix the errors in the individual papers before you try addressing the errors for the entire book. Most of the errors listed here shouldn't occur if you set up the book using the File->New Book... function.
Be careful of imported articles that use a different input encoding to the main book! This will not always produce an error message, but characters will not appear correctly in the PDF file. (See Example 6.)