---
title: "TYPO3 Exception 1365429656"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1365429656"
source: "Exceptions/1365429656.rst"
modified: "2026-09-16T07:39:08+00:00"
---

# TYPO3 Exception 1365429656

> [!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).

## TYPO3 Fatal Error: Extension key "..." is NOT loaded!

### TYPO3 >= 10 LTS

Starting with TYPO3 10 LTS the variable `$_EXTKEY` isn't filled with the
extension key anymore. Solution: use the hardcoded extension key within
ext_tables.php and `ext_localconf.php`.

See this page for further details:
[best-practices-for-ext-tables-php-and-ext-localconf-php](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ExtensionArchitecture/ConfigurationFiles/Index.html#best-practices-for-ext-tables-php-and-ext-localconf-php)

However, notice that $\_EXTKEY [must be used in
ext_emconf.php](https://github.com/TYPO3/CmsComposerInstallers/pull/59).

### TYPO3 < 10 LTS

This error might come up, if you delete the files of a Extension from
the Extension Path (`typo3conf/ext`), which is still activated in TYPO3.

**At first you should check, if there is a typo in the name of the
extension key.**

To solve this error, follow these steps:

*(Info: These steps will remove the installed extensions from the
"loaded Extension list" and TYPO3 cache.)*

1\) remove the Extension from the loaded extension part in
`typo3conf/LocalConfiguration.php` \- `[['EXT']['extConf']['*your_extension_key*']]`

2\) remove either all files from `typo3temp`-folder, or at least the files
in `typo3temp/var/Cache/Code/cache_core` named `ext_tables.php` and
`ext_localconf.php`. In former versions of TYPO3 the folder name is
`typo3temp/var/Cache/Code/cache_core`.

The error should be gone by now and the extension is removed. Reinstall
the extension if needed.

Additionally, this error might come up if you re-structure your TCA files to fit
into the new 6.2 structure. If you try to use `$_EXTKEY` in the
`Configuration/TCA/tablename.php` files (for paths with
`extPath($_EXTKEY)`), then `$_EXTKEY` will be empty and thus TYPO3 looks for
the extension ' '. Solution is to replace `$_EXTKEY` by the extension key of the
extension.

If you encounter this error during an upgrade to 6.2, you might check
your `LocalConfiguration.php` for the right order of extensions in the
deprecated `extListArray`. (e.g. `EXT:formhandler` has to be included
before `EXT:formhandler_subscription`.)