TYPO3 Exception 1294586441¶
Below, the TYPO3 community may have provided additional information or solutions for this exception. However, these may or may not apply to your particular case. If you can provide more information, you should come back here and add your experience and solution steps to this issue once you have resolved it.
General TYPO3 troubleshooting tips can be found in the section “Troubleshooting” of the menu, and live support is available in the TYPO3 Slack channel #typo3-cms.
Oops, an error occurred! “…” is not writable.¶
This happens when your file permissions (Unix) are not correct while including TypoScript from a file and trying to edit it in the backend.
Solution: Change file permissions to make the file writeable
by the webserver, for example
chgrp www-data your/error/message/file && chmod g+w www-data
or move the TypoScript to a location that can be written.