AWS Cloud Directory - unable to determine node type

On trying to run JAVA DK of AWS clouddirectory and creating an object ... i always get this ERROR:

Unable to determine if node is one of LeafNode, Node, Policy, Index (Service: CloudDirectory, Status Code: 400, Request ID: 3448687c-d30f-434e-a4e6-76fbb057f5f1)

I tried to create a specific node, of type index, but it didn't work well! I had same output errors on aws cli, but then it just worked ... still not working with JAVA☕