@danp
I am getting this error

You attempted an operation on a VM that was not in an appropriate power state at the time; for example, you attempted to start a VM that was already running. The parameters returned are the VM's handle, and the expected and actual VM state at the time of the call.
vm: 2fc2b09b-2249-164a-9f60-e408d9c3db82 (Cert test-host_2021-04-07T16:19:20.356Z)
expected: running
actual: halted

the last portion states that I can only do this command on a running vm

Edit:
I created a new vm using terraform and changed ran the suggested command. The result is that the vm operates normally.

The issue now is what is causing this to happen? I don't believe this was an issue for me before.

Thanks for your help.

Hello everyone.
I am having an issue with my VM's created via Terraform. I am unable to restart them.
Pressing the Start button generates the error "no host available"
Below is the error log when I use Start on and select the correct host

vm.start
{
  "id": "45dc0e34-ac73-ccea-ed76-8b7f1cea3238",
  "host": "b2fae86d-40b5-433b-8fd2-09444f2e06d2"
}
{
  "code": "INVALID_VALUE",
  "params": [
    "HVM_shadow_multiplier",
    "0.944444444444"
  ],
  "task": {
    "uuid": "5778b8be-23d1-ad44-9dfc-501354664180",
    "name_label": "Async.VM.start_on",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20210410T21:27:06Z",
    "finished": "20210410T21:27:06Z",
    "status": "failure",
    "resident_on": "OpaqueRef:364d93c4-a7da-4db7-90d7-e292ee78d164",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "INVALID_VALUE",
      "HVM_shadow_multiplier",
      "0.944444444444"
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 191))((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 240))((process xapi)(filename ocaml/xapi/xapi_vm_helpers.ml)(line 501))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 928))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/helpers.ml)(line 1076))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 926))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 1250))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 236))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 83)))"
  },
  "message": "INVALID_VALUE(HVM_shadow_multiplier, 0.944444444444)",
  "name": "XapiError",
  "stack": "XapiError: INVALID_VALUE(HVM_shadow_multiplier, 0.944444444444)
    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/_XapiError.js:16:12)
    at _default (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/_getTaskResult.js:11:29)
    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/index.js:806:24)
    at forEach (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/index.js:827:14)
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/index.js:817:12)
    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202009121357/packages/xen-api/src/index.js:975:14)"
} 

@eperez539
The line #cloud-init should be replaced with #cloud-config. The official xen terraform template is wrong