Moving NFS Datastore to an existing Datastore cluster give error datastore.info.type

i have a cluster with 3 Datastores in it.

The current 3 VMFS datastores come from VNXe storage .The New NFS ones come from a Clariion integrated Cellera NS system.

i want to move to the cluster 2 NFS Datastoers, but it doesn't matter what i try it gives the following error:

Datastore.info.type - parameter was not correct

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