---
title: "TYPO3 Exception 1480765571"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1480765571"
source: "Exceptions/1480765571.rst"
modified: "2026-09-16T07:39:08+00:00"
---

# TYPO3 Exception 1480765571

> [!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).

## Data structure identifier must be set, typically by executing TcaFlexPrepare

If you encounter this error during [FlexForm](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/FlexForms/Index.html#flexforms)
integration:

```text
Data structure identifier must be set, typically by executing TcaFlexPrepare data provider before
```

it means that your FlexForm's XML structure is defective (broken, has
errors, does not parse properly).

## Missing prefix "FILE:"

It occurs, for example, when you try to add a FlexForm file to a CE or plugin,
but forget the prefix `FILE:`:

**EXT:my_extension/Configuration/TCA/Overrides/tt_content.php**

```php
/**
 * WRONG WAY to add a FlexForm file to a content element
 */
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPiFlexFormValue(
    '*',
    'EXT:my_extension/Resources/Private/FlexForm/MyFlexForm.xml',
    'myextension_textpic'
);

/**
 * CORRECT WAY to add a FlexForm file to a content element
 */
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addPiFlexFormValue(
    '*',
    'FILE:EXT:my_extension/Configuration/FlexForms/MyFlexForm.xml',
    'myextension_textpic'
);
```