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Get the following error:

An exception of type ‘Groupdocs.Utils.JsonFileException’ occurred in Groupdocs.Web.Annotation.dll but was not handled in user code

Additional information: Failed to serialize an object to file: ‘{0}’.

If there is a handler for this exception, the program may be safely continued.


This results in the popup dialog “There is no such reviewer”


Hello Stuart,

We are sorry to hear that you have this issue and sorry for the delay. You’ve described this problem in several other forum posts, in particular, here “BUG: There is no such reviewer”. My colleague today will answer on this post; maybe, his answer will be able to solve this issue.

If not, please provide us more details like screenshot(s), stack trace of the exception and a part of the source code, where exception occurs.