issue when creating vm from snapshot

PS C:\Windows\system32> $snapshot = Get-AzureRmSnapshot
PS C:\Windows\system32> $resourceGroupName ='prod'
PS C:\Windows\system32> $snapshotName = 'vm3copy'
PS C:\Windows\system32> $osDiskName = 'myvm3disk'
PS C:\Windows\system32> $virtualNetworkName = 'prod-vnet'
PS C:\Windows\system32> $virtualMachineName = 'myVM3'
PS C:\Windows\system32> $virtualMachineSize = 'Standard_DS3'
PS C:\Windows\system32> $snapshot = Get-AzureRmSnapshot -ResourceGroupName $resourceGroupName -SnapshotName $snapshotName
PS C:\Windows\system32> $diskConfig = New-AzureRmDiskConfig -AccountType $storageType -Location $snapshot.Location -SourceResourceId $snapshot.Id -CreateOption Copy
**PS C:\Windows\system32> $disk = New-AzureRmDisk -Disk $diskConfig -ResourceGroupName $resourceGroupName -DiskName $osDiskName**
New-AzureRmDisk : The request content was invalid and could not be deserialized: Required property 'name' not found in 'sku'.
ErrorCode: InvalidRequestContent
ErrorMessage: The request content was invalid and could not be deserialized: Required property 'name' not found in 'sku'.
ErrorTarget:
StatusCode: 400
ReasonPhrase: Bad Request
OperationID : 78d284c4-7180-47c0-a808-907519b9827b
At line:1 char:9
+ $disk = New-AzureRmDisk -Disk $diskConfig -ResourceGroupName $resourc ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : CloseError: (:) [New-AzureRmDisk], ComputeCloudException
+ FullyQualifiedErrorId : Microsoft.Azure.Commands.Compute.Automation.NewAzureRmDisk

Start with the New-AzureRmDisk invocation and the preceding New-AzureRmDiskConfig commands shown in the issue. Inspect the resulting disk configuration and Azure request requirements, then reproduce the command and confirm it completes without the InvalidRequestContent error.

Written by the indexing model from the issue text.