Problem with saving Sheets. Is there a list of error codes?

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Smartsheet is frequently refusing to save changes in my sheet. It gets to the point where I have to save after every change I make to the sheet, and will be forced to reload (and lose changes) after every other change. The dialog box with further information mentions error code 6. Is there a list of error codes and ideally solutions?

I have the most recent version of Google Chrome and cannot identify any extensions that might be using smartsheet.

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