New version 3.0 of DCE and TYPO3 v12 contain various changes, which requires some manual adjustments.
DCE provides some upgrade wizards in install tool of TYPO3, which pop up when necessary.
Just change your requirements section to
Then go to TYPO3 Install Tool and check (and perform) the upgrade wizards and database compare!
Also, make sure you've deleted the DCE cache files (located in
Templates in fileadmin¶
If you still use DCE templates located in fileadmin, loaded via FAL, you need to make manual adjustments.
The only way to load DCE template files, is using the
EXT: syntax. For example: