After Update to version 3.0.1 with TYPO3 7.6.23 the editor is not loaded
After Update from 2.2.2 to version 3.0.1 in an installation with TYPO3 7.6.23 (PHP 7, compatibility layer ext. NOT installed) the editor is not loaded (only the sourcecode is shown in the editor field). The base extension tinyMCE is installed in the newest version 5.0.1. What can I do? I cleared the cache by the installtool, cleared typo3temp/Cache/, all .js and .zip files in typo3temp, logged out and again in, nothing changed.
Firebug Console shows the following error: SyntaxError: expected property name, got ',' ,language: 'de' typo3temp/tinymceConfigurationd010dc3431c6575526f2b8f72ff36432fafcb357.js?bust=f57633e98115aa27d191c373dc2601e1ba6a837e (line 86)
Is this a bug or what else could be the cause?