java.lang.NullPointerException: This exception has no message.

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via GitHub by damithc
, 1 year ago
This exception has no message.
at teammates.logic.core.FeedbackSessionsLogic.copyFeedbackSession(
at teammates.logic.api.Logic.copyFeedbackSession(
at teammates.ui.controller.InstructorFeedbackCopyAction.execute(
at teammates.ui.controller.Action.executeAndPostProcess(
at teammates.ui.controller.ControllerServlet.doPost(
at javax.servlet.http.HttpServlet.service(
at javax.servlet.http.HttpServlet.service(
at org.mortbay.jetty.servlet.ServletHolder.handle(

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