Thread:Project:Support desk/MWException/reply

You are obviously processing jobs in the background. In your stacktrace it is the job "DTImportJob". This job tries to update a page, but it seems like this page is not there. So the correct thing to do would be not to try updating the page, but to try creating it.

The problematic job obviously comes with the extension DataTransfer_PS, so I would check, if an update for this extension is available.