Thank you for the resources provided.
The error trace below is not sufficient in order to identify the source of the issue. Can you please provide some additional information - when did the error start to occur, does occur on every page with every content widget, or on a specified page and some content widgets?
Additionally, if you can attach your Error.log file located in your App_Data/Sitefinity/Logs folder to your reply for me to examine, this will help us arrive at a solution as well.
Your cooperation is appreciated. Looking forward to your response.
Ivan D. Dimitrov
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