API services returning empty list of clusters

Hello everyone, 

I have just installed (with lot of problems on the way Smiley Happy  OnCommand API Services. 

I have added a single cluster for tests. 

When I try to get the list of clusters with 



I'm getting response with empty list


<apiServerResponse xmlns:xsi="" xsi:schemaLocation="">



however if I try to get 


I'm getting this single cluster without any issue. 

What am I doing wrong?