TYPO3 Exception 1504804727

Note

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 Troubleshooting section in the menu. You can also ask questions and receive support in the TYPO3 Questions category on talk.typo3.org.

To add your experience, click "Edit on GitHub" above and follow the "Edit on GitHub" workflow. Also check out our tip on Coding Style and reST.

[10.4] - [9th April 2021]

Situation

The TYPO3 backend throws an exception, when I click on Extensions.

(1/1) #1504804727 RuntimeException

This module "tools_ExtensionmanagerExtensionmanager" is only available as system maintainer
in /foo/bar/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php line 464

Solution

The currently logged in backend user has been removed from the system maintainers list. Ask for access to be granted again by a backend user who is a system maintainer. Any system maintainer may grant access to other users.