Soap fault detected, Get Changed Block problem

Hello All,

We have about 100 VMs that are somehow defaulting to level zero backup due to the below mentioned error. Any help is appreciated.

2017-11-14 09:32:57 avvcbimage Warning <16004>: Soap fault detected, Get Changed Block problem, Msg:'SOAP 1.1 fault: "":ServerFaultCode [no subcode]

"Error caused by file /vmfs/volumes/58c956ea-e412384f-9296-5cb901d376b0/SRV00560/SRV00560-000002.vmdk"

Detail: /vmfs/volumes/58c956ea-e412384f-9296-5cb901d376b0/SRV00560/SRV00560-000002.vmdk

2017-11-14 09:32:57 avvcbimage Warning <14650>: The change-block list (pass 1) could not be found for 'Avamar-1510651890e539cb5bb026ccf943bcf26a4f8ea2f2913b2100', change blocks will not be used.

2017-11-14 09:32:57 avvcbimage Info <18664>: Login(https://vcenter.vi.corp:443/sdk) Datacenter: 'NL001'

2017-11-14 09:32:57 avvcbimage Info <19728>: - connected to 'VirtualCenter' - version: 'VMware vCenter Server 6.5.0 build-5973321', apiVersion:'6.5'

We are using Avamar version 7.4.

Thank you,

Suraj.