When you receive the message WARNING: An Error occurred, please refresh the page and try again., that implies that you've got a debug-log file waiting in your store's /logs folder (ZC 1.5.1 and later; /cache folder for earlier versions) that indicate the source of the error. Since the issue occurred during admin-level processing, make sure to xxx-out your admin folder's name before posting the contents!
It would also help to know which version of the News Box Manager plugin you've got installed.
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