Application error --- V aplikaci nastala chyba

class timetable.beans.Timetable cannot be cast to class timetable.beans.Timetable (timetable.beans.Timetable is in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @30814012; timetable.beans.Timetable is in unnamed module of loader org.apache.catalina.loader.ParallelWebappClassLoader @62266e4a)