What is the issue?
This error means that the desktop tools are configured with an invalid Recast Management Server URI. The default URI during installation is https:///MobileToolsEnterprise.svc, which is an invalid URI. To fix this, we can either reinstall the Recast Desktop Tools specifying the URI during installation, or modify the registry value that the desktop tools use.
If you reinstall the desktop tools, the first screen in the installation wizard is the one you want to watch out for. In this screen, enter the Recast Management Server URI. You can also specify the Recast Management Server URI on the command line with the RCTENTERPRISESERVER MSI property.
The desktop tools use the ServerUri value under "\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Recast Software\Recast RCT". This value should be the Recast Management Server URI with port included. Example: https://demo-rms-prod.demo.recastsoftware.com:444/