---
title: "TYPO3 Exception 1504804727"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1504804727"
source: "Exceptions/1504804727.rst"
modified: "2026-09-16T07:39:08+00:00"
---

# 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](https://talk.typo3.org/c/typo3-questions/).
>
> To add your experience, click "Edit on GitHub" above and follow the
> ["Edit on GitHub" workflow](https://docs.typo3.org/m/typo3/docs-how-to-document/main/en-us/Howto/EditOnGithub.html#docs-contribute-github-method).
> Also check out
> [our tip on Coding Style and reST](https://docs.typo3.org/permalink/t3exceptions:tip-about-rest-coding-style).

## \[10.4\] - \[9th April 2021\]

### Situation

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

```none
(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.