Error- what is the definition of this error and how do i fix it.

Question

Exception in thread "main" java.lang.RuntimeException: Uncompilable source code - Erroneous sym type: java.awt.EventQueue.invokeLater
at question1and2.LibraryBookingSystem.main(LibraryBookingSystem.java:584)
Java Result: 1

Answer 1

See
http://stackoverflow.com/questions/2333285/java-lang-runtimeexception-uncompilable-source-code-what-can-cause-this