Can't include CALDAV-calendar

Its a pity - eMClient seemed to be a very good program, but I can not even include a simple CALDAV-Kalender ( (“connection failed - server cannot be contacted or the settings are not correct”) Both IS correct!!! Server is NOT out of use! When there is no chance to solve this problem, the program is useless for me, because my main calender is the most important thing in my daily work. Can you help me?

sorry for the delay - can you please send me your CalDAV log? Go to menu Tools->Settings->Advanced->Logging and check “CalDAV” under the problematic account. Then restart eM Client, try to simulate the issue and send us (with reference to this topic) the logs using the same logging settings window. Thank you.