org.unitime.timetable.gwt.shared.SectioningException: This exception has no message.

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This might be an issue with the file location in the Spark submit command. Try it with

spark-submit --master spark://master:7077 \ {file location}

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Check if you've set a name in Application -> Run. If you didn't, the generated XML is gonna have missing information and then this exception will be thrown.

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at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(
at org.unitime.timetable.solver.jgroups.OnlineStudentSchedulingContainer.createInstance(
at org.unitime.timetable.solver.jgroups.OnlineStudentSchedulingContainer.createSolver(
at org.unitime.timetable.solver.jgroups.LocalSolverServer$Updater.checkForNewServers(
at org.unitime.timetable.solver.jgroups.LocalSolverServer$

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