---
title: "TYPO3 Exception 1404068038"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1404068038"
source: "Exceptions/1404068038.rst"
rendered: "2026-09-26T07:32:33+00:00"
---

# TYPO3 Exception 1404068038 {#typo3-exception-1404068038}

> [!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).

## No extension key could be determined when calling `addPlugin()` {#no-extension-key-could-be-determined-when-calling-addplugin}

You will see this exception most likely because
`\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin()` is used
in a `ext_tables.php` file, which will not work. As described in the API
`\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPlugin()` is
meant to be called from `ext_tables.php` or (as of TYPO3 6.2.4 or later) in a file
in `Configuration/TCA/Overrides/tt_content.php`. Calling it from any other
place e.g. `ext_localconf.php` does not work and is not supported

If you call it from `Configuration/TCA/Overrides/tt_content.php`, the
extension key needs to be specified as third parameter.