Attached file is missing

During sharing, a message like: "Attached file is missing - D:\Qg4\MyUser\C505306F534B44ECB1AB7038B6I1E2\Job\7\1\{0c707283-f87d-4455-b46f-05c97f71f8db}\NP19_0_WS.QuadriModel.WS" might show up, cancelling the share.

This is mostly from some WS task that has not cleaned up properly after deleting things. The problem might be fixed as follows:

This process should recreate the missing files and also delete any mess left behind by this task.