On this page:
...
This error can also occur if you are writing to a Google Sheet using a business rule, and you have a text or textarea control that gets a value with a comma at runtime. For example, if you are passing a control in theĀ var updateparams rule such as "FullName" and the runtime value entered is "Smith, John" the comma can interfere with the comma-separated update parameters being passed to the Google Sheet. This will be fixed in a future release. A workaround is to add code to your rule to strip the commas:
...