Keep getting error when "TypeError: Cannot read property "virtualMachineID" from null (Dynamic Script Module name : getPropertiesFromVirtualMachine"

I keep getting the error below when i run my workflow :

[2019-06-23 12:29:13.783] [I] 1 match uuid: 50320c66-3431-ed1d-68ad-f96256cf4290

[2019-06-23 12:29:13.786] [I] Resolved vCAC VM: vROps-ap1

[2019-06-23 12:29:13.841] [E] Workflow execution stack:

***

item: 'Get Info/Shutdown (UC1)/item3', state: 'failed', business state: 'null', exception: 'TypeError: Cannot read property "virtualMachineID" from null (Dynamic Script Module name : getPropertiesFromVirtualMachine#1)'

workflow: 'Get Info/Shutdown (UC1)' (fd7316ef-7b9b-483a-b5df-5d5d07e45c1b)

|  'attribute': name=VMName type=string value=

|  'attribute': name=VMAddress type=string value=

|  'attribute': name=VMOwner type=string value=

|  'attribute': name=VMBsgroup type=string value=

|  'attribute': name=VMReservation type=string value=

|  'attribute': name=actionResult type=vCAC:VirtualMachine value=__NULL__

|  'attribute': name=vCACIaaSHost type=vCAC:VCACHost value=__NULL__

|  'attribute': name=errorCode type=string value=TypeError: Cannot read property "virtualMachineID" from null (Dynamic Script Module name : getPropertiesFromVirtualMachine#1)

|  'input': name=vCenterVm type=VC:VirtualMachine value=dunes://service.dunes.ch/CustomSDKObject?id='10.20.20.50%2Cid:vm-32'&dunesName='VC:VirtualMachine'

|  'output': name=actionResult1 type=vCAC:VirtualMachine value=dunes://service.dunes.ch/CustomSDKObject?id='31b63e72-1b20-4cc6-a61b-5af4db5f8ee3/ba9a8a14-17ae-45f4-abbe-dca45f3fc0d0'&dunesName='vCAC:VirtualMachine'

*** End of execution stack.

Flow chart is as below:

Code from QCgetvCACVmFromvC action:

//Auto generated script, cannot be modified !

actionResult = System.getModule("org.company.mymodule").QCgetvCACVmFromvCenterVmUuid(vCenterVm) ;

Code from show info:

//Gets the IP Address Of the VM

vCACVmExtendedProps = System.getModule("com.vmware.library.vcac").getPropertiesFromVirtualMachine(vCACIaaSHost,vCACVM);

VMAddress = vCACVmExtendedProps.get("__datacollected_ipaddress");

//Gets the name of VM

VMHostname = vCACVM.vmDNSName;

//Gets the owner of VM

VMOwner = vCACCAFEFilterParam.substringOf("owners/ref",vCACCAFEFilterParam.string("user@domain.com"));

//Gets the Business Group of the VM

var VMBsgroup = System.getContext().getParameter("_asd_subTenantref")

//Gets the Reservation of the VM

var id = virtualMachine.getEntity().getProperty("HostReservationID");

var entity;

var idprop = new Properties( {

"HostReservationID" : id

});

if (!id || id == "") throw "Error getting Reservation ID of VM.";

if (host != null) {

entity = vCACEntityManager.readModelEntity(host.id, "ManagementModelEntities.svc", "HostReservations", idprop, null);

} else {

var hosts = Server.findAllForType("vCAC:VCACHost");

System.debug("hosts: " + hosts);

for each (var host in hosts) {

try {

entity = vCACEntityManager.readModelEntity(host.id, "ManagementModelEntities.svc", "HostReservations", idprop, null);

} catch (e) {

throw "Error reading model entity.";

}

}

}

VMReservation = entity.getInventoryObject();

//Return Values

Server.log("Hostname : " + VMHostname);

Server.log("IP Address : " + VMAddress);

Server.log("Owner : " + VMOwner);

System.log("Business Group name: " + VMBsgroup);

System.log("Reservation of VM: " + VMReservation);

I'm not sure what the issue might be?