---
title: "TYPO3 Exception 1661540376"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1661540376"
source: "Exceptions/1661540376.rst"
rendered: "2026-10-01T16:20:50+00:00"
---

# TYPO3 Exception 1661540376 {#typo3-exception-1661540376}

> [!NOTE]
> Below, the TYPO3 community may have provided additional information or
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> particular case. If you can provide more information, you should come back
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>
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>
> To add your experience, click "Edit on GitHub" above and follow the
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> Also check out
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## TYPO3 \[version\] - \[date of report\] {#typo3-version-date-of-report}

### Installation Overview {#installation-overview}

TYPO3 14.3 with not acitvated extension tt_board and records of it. The routing contains a config.yaml which contains tt_board records:

**EXT:tt_board/config.yaml**

```yaml
TtBoardList:
   type: Plugin
   routePath: '/boardl/{uid}'
   namespace: tt_board_list
   aspects:
     uid:
       type: PersistedAliasMapper
       tableName: tt_board
       routeFieldName: slug
```

### The Issue {#the-issue}

The front end with speaking url shows this exception:

> [!WARNING]
> **#1661540376 TYPO3\\CMS\\Core\\Schema\\Exception\\UndefinedSchemaException**
> No TCA schema exists for the name "tt_board".
>
> /path/typo3_src-14.3.0/typo3/sysext/core/Classes/Schema/SchemaCollection.php:76:

**EXT:tt_board/config.yaml**

```php
public function get(string $schemaName): TcaSchema
{
   if (!$this->has($schemaName)) {
       throw new UndefinedSchemaException('No TCA schema exists for the name "' . $schemaName . '".', 1661540376);
   }
   if (str_contains($schemaName, '.')) {
       [$mainSchema, $subSchema] = explode('.', $schemaName, 2);
       return $this->get($mainSchema)->getSubSchema($subSchema);
```

### Solution {#solution}

Activate the extension tt_board which contains the TCA for the table tt_board.