VMWare VIX vmrun.exe gives insufficient permissions error

VMWare VIX vmrun.exe gives insufficient permissions error

When I try to start a vm using the following command
vmrun -t esx -h https://myserver.com/sdk -u domain\user -p * start "[datastore1-mydata] vmname/vmname.vmx"
I get an error message
Cannot open VM: [datastore1-mydata] vmname/vmname.vmx, Insufficient permissions in the host operating system"
However when I type
vmrun -t esx -h https://myserver.com/sdk -u domain\user -p ******* list
I do get a list of all the vms
I have administrator permissions on the said vm. Also, when I try to do the same thing using powercli, it works perfectly
What could be the problem?
Thanks