I hate to be one of those people who just say "I had exactly the same issue, and i still can't figure it out"... but... but... well, yeah...
I had exactly the same issue, and i still can't figure it out
--EDIT--
Nevermind, found a solution, Really simple... just fix the syntax errors and get rid of the parameters in front of jComboBox (litterly just remove the <E> part)
everything compiles fine after that