[TYPO3-calendar] Error with frontend editing

[Florian Diederich]

When trying to add a record in the frontend, I get the following  
error-message:

  " Call to undefined method  
TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer::removeBadHTML()  "

I´m using Typo3 9.5.20 and cal. 2.0.

Thanks  in advance!