When "ERROR:null" is displayed after clicking the All Tasks tab, implies that one or more of the task instances are stuck and executing. We can still search for tasks by going to the Find Tasks tab and checking only the "is Finished/Executing/Ready" option and clicking the search button. Delete the executing or hanged tasks through the debug page->Task Instances. There may be more than one such task instances. We can have java program clean-up such instances. This occured when xml parse exceptions are encountered.
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