---
title: "TYPO3 Exception 1518472189"
manual: "TYPO3 Exceptions"
version: "main"
permalink: "https://docs.typo3.org/permalink/t3exceptions:typo3-exception-1518472189"
source: "Exceptions/1518472189.rst"
rendered: "2026-10-01T16:20:50+00:00"
---

# TYPO3 Exception 1518472189 {#typo3-exception-1518472189}

> [!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).

## Path is not found (TYPO3 version 9.5) {#path-is-not-found-typo3-version-9-5}

The error is shown if the requested page can't be found for one of the
following or further reasons:

-   Slugs are defined for pages but there is a fault in the definitions
    (for example a trailing slash or the path is broken).
-   This may happen with a PersistedAliasMapper definition if the record
    you try to decode is stored **outside** of your site.
-   If there are several domains defined in one TYPO3-installation and a
    page includes a link to a page that is in another domain but still to
    another page inside the TYPO3-installation.
-   If there are several domains defined in a TYPO3-installation and one
    some configurations share the same rootPageId

## Request parameters could not be validated {#request-parameters-could-not-be-validated}

Some parameters in your url should not be part of the cHash generation.
You must add them to the cacheHash excluded parameters list in the
install Tool. For example the eID parameter for Ajax calls should not be
part of the cHash generation.

## How to fix cross-domain problems (TYPO3 version 9.5)? {#how-to-fix-cross-domain-problems-typo3-version-9-5}

-   Create a site-configuration for the rootpage of each domain in the
    TYPO3-installation's pagetree.

## How to fix slug related problems (TYPO3 version 9.5)? {#how-to-fix-slug-related-problems-typo3-version-9-5}

-   Fix the slugs starting with the root-page for each domain in the
    TYPO3-installation's pagetree. Each rootpage should be
    configured with the slug "/" only. Each page down the hierarchy
    can be configured automatically or manually, but the path up must be
    correct. Trailing slashes in the path are not allowed.
-   If you use Apache-Webserver make sure that in the TYPO3 root is a
    ".htaccess"-file, see [Apache .htaccess configuration file](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Administration/Installation/SystemRequirements/Index.html#htaccess).
-   If you use Nginx-Webserver make sure that web-access to the
    TYPO3-root is configured accordingly to the previous list-point.

## How to fix issues regarding multiple site configurations with the same rootPageId (TYPO3 version 9.5)? {#how-to-fix-issues-regarding-multiple-site-configurations-with-the-same-rootpageid-typo3-version-9-5}

-   Remove the offending configuration or consolidate the configurations
    in one file