In some rare cases, Mailster shows this error after an ajax request doesn’t respond to a valid JSON:
parsererror 200: SyntaxError: JSON.parse: unexpected character
![parse_error](https://kb.mailster.co/wp-content/uploads/2013/11/parse-error.png)
This error is often caused by third-party plugins or some unexpected server outputs.
Please open the developer console to see the problem with this error.