There is an intermittent issue with the UploadImage() implementation in github.com/nutanix-cloud-native/prism-go-client@v0.3.4, on which the OCP installer depends. When testing the OCP installer with ClusterAPIInstall=true, I frequently hit the error with UploadImage() when calling to upload the bootstrap image to PC from the local image file. 

The error logs:
INFO creating the bootstrap image demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso (uuid: 75694edf-f9c4-4d9a-9a44-731a4d103cc8), taskUUID: c8eafd49-54e2-4fb9-a3df-c456863d71fd.
INFO created the bootstrap image demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso (uuid: 75694edf-f9c4-4d9a-9a44-731a4d103cc8).
INFO preparing to upload the bootstrap image demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso (uuid: 75694edf-f9c4-4d9a-9a44-731a4d103cc8) data from file /Users/yanhuali/Library/Caches/openshift-installer/image_cache/demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso
ERROR failed to upload the bootstrap image data "demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso" from filepath /Users/yanhuali/Library/Caches/openshift-installer/image_cache/demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso: status: 400 Bad Request, error-response: {
ERROR   "api_version": "3.1",
ERROR   "code": 400,
ERROR   "message_list": [
ERROR   { ERROR     "message": "Given input is invalid. Image 75694edf-f9c4-4d9a-9a44-731a4d103cc8 is already complete", ERROR     "reason": "INVALID_ARGUMENT" ERROR    }ERROR   ],
ERROR   "state": "ERROR"
ERROR }
ERROR failed to fetch Cluster: failed to generate asset "Cluster": failed to create cluster: failed preparing ignition data: failed to upload the bootstrap image data "demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso" from filepath /Users/yanhuali/Library/Caches/openshift-installer/image_cache/demo-ocp-cluster-g1-lrmwb-bootstrap-ign.iso: status: 400 Bad Request, error-response: {
ERROR   "api_version": "3.1",
ERROR   "code": 400,
ERROR   "message_list": [
ERROR   { ERROR     "message": "Given input is invalid. Image 75694edf-f9c4-4d9a-9a44-731a4d103cc8 is already complete", ERROR     "reason": "INVALID_ARGUMENT" ERROR    }ERROR   ],
ERROR   "state": "ERROR"
ERROR } The OCP installer code calling the prism-go-client function UploadImage() is here:https://github.com/openshift/installer/blob/master/pkg/infrastructure/nutanix/clusterapi/clusterapi.go#L172-L207    

    1.
    2.
    3.
    

The installer intermittently failed at uploading the bootstrap image data to PC from the local image data file.

 The installer successfully to create the Nutanix OCP cluster with the install-config ClusterAPIInstall=true.