The domain of the installation path is invalid

A customer tries to use APS installer but gets an error when trying to create a installation. What I notice is there no domain name at:

I checked permissions an I think everything is configured correctly?

 

Any tips for this issue?

 

Which ispconfig vers. do u use ?
Does that site exists with a good root folder ?

 

Hi Tim,
I use the latest version 3.0.5.3
The website is online and working.

When I login as admin in ispconfig I can install aps software for this domain without issues.

 

Anybody any tips or suggestions?

Max. number of APS instances is set to 10.