XML Fehler: Not well-formed (invalid token)

Hi there!

Your plugin crashed our website today, for some reason we were not able to access the WP back-end, this message was displayed:

Bad: [XML] XML Fehler: Not well-formed (invalid token) in Zeile 1

I found info about this Error here:
https://stackoverflow.com/questions/77083772/bad-xml-xml-fehler-not-well-formed-invalid-token-in-zeile-1

After I disabled your plugin in cPanel’s File Manager (renamed the folder with your plugin), everything worked fine.

So, can you please explain why this happened and if there is solution to this error? Otherwise we will not be able to use WP Forecast on our site any more.

Please let me know ASAP. Thanks!