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To workaround this issue replace the current VDDK 7 API with VDDK 6 API. Download the VDDK v6 API files from here
However, after the changes have been made. AhsayOBM v8.3.4.0 or above installation will no longer support backup of VMware vCenter/ESXi v7 backup sets
VMware vCenter/ESXi, v5.0,v5.1, VDDK backup mode, VDDK 7 API