ChronoForms V5 doesn't work after changing webhoster/server

Hello,
I changed the Webhoster and travelled with my domain to a new server.
After reinstallation of my old site chronoforms doesn't work. When i enter the Menupoint chronoforms i became an error: the Site isn't available.
in the URL between old and new is a change: old-> neu.szbredstedt.de new-> www.szbredstedt.de
Where is the screw i have to rotate that it worked again?
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Greets

Hi RolloMan,
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I don't know what would cause that. What is the URL you see when ChronoForms is not found?
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Have you got a livesite setting in the Site Config.php file?
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Bob

What is the URL you see when ChronoForms is not found?

https://www.szbredstedt.de/administrator/index.php?option=com_chronoforms5&view=main,
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Have you got a livesite setting in the Site Config.php file

I don's know.
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I've deleted Chronoforms in my Joomla-Installation and reinstalled it - no changes.

Hi RolloMan,
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The URL looks OK so I can only guess that there is some site security setting that is blocking the component. Please double check that the component is enabled in the Extension Manager.
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Bob

Please double check that the component is enabled in the Extension Manager.

Check

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Here is the Server Error Protocol when I want to use chronoforms in the backend:

Hi Rolloman.
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Please see the section 'Code bugs with PHP 7' in this FAQ.
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You might also check that you have the latest release of CFv5 installed as I think this was fixed in CFv5.0.11
Bob