Unable to register as the CMS has sent an error

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1

Hi

Im getting this error message when i try to connect to the CMS

Unable to register as the CMS has sent an error. Call to undefined function Symfony \Polyfill\Mbstring\icinv_strops()

Any ideas whats wrong? Everything was working fine. I changed host and activated my Android license and now this message comes

2

What CMS and player versions are you using?

I assume this is on-premise custom installation on a web server?
Could you tell us more about it and what exactly have you changed recently please?