Opsi package builder error

[mb253400]

I'm trying to setup opsi package builder and opsi setup detector to create opsi packages. I have encountered this error.
Here is the output in the logfile.
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2024-05-01, 13:00:05
opsi PackageBuilder version: 8.5.0
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<class 'IndexError'>:
string index out of range
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File "oPB\controller\settings.py", line 218, in save_config
File "oPB\controller\settings.py", line 157, in update_backend_data
File "oPB\core\confighandler.py", line 452, in dev_dir

[PHackert]

There were no reactions here.
I just installed the opsi 4.3 Server VM and installed the packageBuilder 8.5.0 (is this the most recent one?)
As soon as I want to put in the connection-Data of my server to the settings, there is this same error message.
It doesn't matter if i start the Software as administrator or as user. The behaviour is in both cases the same.

Does anyone has an advice/hint how to get my Server-Settings into this tool? or is there a newer version?
I mean, it is opsi 4.0 or 4.1 (or higher) compatible, on the first sight. But if there is a newer version, I'd be glad, if someone will provide a link to that setup.

thanks in advance!