Hi That bug seem to happen at any moment. You have an error in your code and netbeans don't display the line.
Get it with netbeans 8 to 10. this bug seem to happen since many year. https://stackoverflow.com/questions/41834069/java-netbeans-errors-not-showing-up https://netbeans.org/bugzilla/show_bug.cgi?id=258801 https://netbeans.org/bugzilla/show_bug.cgi?id=235050 https://netbeans.org/bugzilla/show_bug.cgi?id=114446 https://netbeans.org/bugzilla/show_bug.cgi?id=235958 Happen less then before. thanks
