Error-message-when-trying-to-authenticate-WL6

Hi

I receive this error message when trying to login to WL. What can I do?

OS: Microsoft Windows NT 6.2.9200.0
UTC: 2021-03-23T13:07:29.0160890Z
Command Line: "C:\Program Files\MS123\Wealth-Lab Developer 6\WealthLabDev.exe"
Product Name: Wealth-Lab Developer 6
Version: 6.9.15.0
Auth Mode: FromApplication
Error: Exception - Fehler: Leere Antwort auf Anforderung.