TYPO3 Exception 1256475113

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The argument “arguments” was registered with type “array”, but is of type “string” in view helper

This problem is related to the use of an extended Fluid syntax like this:

<a href="{be:moduleLink(route:'system_reports',arguments:{action:'detail', extension:extensionKey, report:reportName})}">

In some versions of PHP, there is a PCRE bug with the underlying readline library: https://github.com/TYPO3/Fluid/commit/865890c3cffaf8d5f6aa44295d42a84a103895ec

A possible fix (for the example above) is to enclose the array arguments with single quotes like that:

<a href="{be:moduleLink(route:'system_reports',arguments:'{action:\'detail\', extension:extensionKey, report:reportName}')}">

This effectively forces Fluid to extract the content of the single quotes with a simpler regular expression instead of a recursive one.

Another possible cause of this error may be a PHP-configuration problem: PHP 7.3.14:

pcre.jit = 1

jit (Just in time compiler) had to be enabled in my installation.