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You update your portal jar with in workshop to make sure it is related to new one but on from older version.
Major problem when we upgrade an app from lower ver of workshop to higher version workshop it copy older jar files which we need to a manual work.
So get into project >> java build
check any warning or error symbols are seen remove them and add new one.
it will fix the problem.
Still you get problem let me know with error stack.
Note: try to use Ctrl + F1 button to for quick fix.