The Method 'invalidateArchivedReports' does not exist (no replies)

Hello,

I want to try to invalidate log entries by calling "invalidateArchivedReports" (see https://piwik.org/faq/how-to/faq_155/), but I get this error message (the translation is "The method 'invalidateArchivedReports' doesnot exist or is not available in the module '\Piwik\Plugins\CoreAdminHome\API'"):

<result>
    <error message="Die Methode 'invalidateArchivedReports' existiert nicht oder ist im Modul '\Piwik\Plugins\CoreAdminHome\API' nicht verfügbar."/>
</result>

The URL i use to call it is like this:

http://test.invalid/?module=API&method=CoreAdminHome.invalidateArchivedReports&idSites=1&dates=2015-07-16&token_auth=1234567890

I'm using Piwik 2.14.1.

Any idea why it doesn't work?

Best regards!
Stefan Wagner