Warrnambool Drags Racing UTF-8 Attempted to call undefined function "iconv_strlen" from namespace "Symfony\Polyfill\Mbstring". (500 Whoops, looks like something went wrong.)

UndefinedFunctionError

HTTP 500 Whoops, looks like something went wrong.

An Error Occurred: Whoops, looks like something went wrong.

Sorry, there was a problem we could not recover from.

The server returned a "500 - Whoops, looks like something went wrong."

Help me resolve this