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Sorry you are experiencing this. Does this occur when you log into your site editor and the page stops loading and then shows this error or are you able to open your site editor and add or delete widgets?
I wonder... Have you recently added any HTML code to a widget on your site? That is the most likely cause of the problem. If you delete the newly added HTML the problem should be fixed. Sometimes the error report happens when you add a piece of code which is invalid and conflicts with the system.
Sadly there are only a few things that in the past have worked for me if you cannot access the widgets to delete them. You can try looking at this post for some help.