TYPO3 Upgrade vom 11.2.0 to 11.5.0 - Problems with Form Extension and EXT: path in Frontend

Question

I have upgraded a TYPO3 installation from 11.2.0 to the latest version of today 11.5.0.

After changing my symlinks to the new TYPO3 source files, cleaning all caches, performing all upgrade wizards successfully and without errors, I get 2 new error messages that I haven't seen in previous TYPO3 installations. One in the backend and one in the frontend.

Frontend:

503 - Resource paths must start with "EXT:" and must reference Resources/Public

and in the Backend:

503 - TYPO3.CMS.Form.mixins.formElementMixins.FormElementMixin does not exist within the configuration

I am currently finding out the source of the problem. Since Google has no content about these new issues, I thought it would be a good idea to create this thread.

Does anyone have similar problems upgrading to TYPO3 11.5.0?

Answer 1

I found the answer to the frontend error message Resource paths must start with "EXT:" and must reference Resources/Public myself after looking deeper into the error messages.

I included a SASS file for the bootstrap_package like this in my setup:

page{
    includeCSS{
        custom = EXT:my_package/Resources/Private/Scss/style.scss
    }
}

After I changed "Private" to "Public", the error message disappeared.

page{
    includeCSS{
        custom = EXT:my_package/Resources/Public/Scss/style.scss
    }
}

Conclusion: Apparently TYPO3 now makes sure that your resource paths are named the right way and do NOT point to any other directory.