volumebased and/or diskbased cloning for bootable disk

Hello, i want to do a p2v job to only convert the C: drive of my source machine, wich is the one with the os.

i modified the dot net sample with this code:

1. converterStorageParams.cloningMode = "volumeBasedCloning";
2.          ConverterComputerSpec computerSpec = new ConverterComputerSpec();
3.          computerSpec.location = Common.BuildLiveSourceLocation(_sourceName, _sourceUsername, _sourcePassword,
4.                                                                   _sourceOsType, false, "");
5.          ConverterComputerInfo computerInfo = _converterServer._converterService.ConverterQuery(_converterServer._converterServerContent.queryManager, computerSpec);
6.          //
7.          ConverterStorageParamsManagedTargetDiskParams targetdisk;
8.           for (int diskcount = 0; diskcount < computerInfo.osInfo.logicalVolumeInfo.Length; diskcount++)
9.          {
10.              if (computerInfo.osInfo.logicalVolumeInfo[diskcount].mountPoint[0] == "C:")
11.              {
12.                  ConverterStorageParamsVolumeCloningParams volume;
13.                  volume = new ConverterStorageParamsVolumeCloningParams();
14.                  volume.resize = false;
15.                  volume.sourceVolumeId = computerInfo.osInfo.logicalVolumeInfo[diskcount].volumeId;
16.                  targetdisk = new ConverterStorageParamsManagedTargetDiskParams();
17.                  targetdisk.volumesToClone = new ConverterStorageParamsVolumeCloningParams[]{volume};
18.                  targetdisk.datastoreName = "SnapServer";
19.                  converterStorageParams.targetDiskParams = new ConverterStorageParamsManagedTargetDiskParams[1];
20.                  converterStorageParams.targetDiskParams[0] = targetdisk;
21.              }
22.          }
23.         converterStorageParams.vmxDatastoreName = "SnapServer";

It is working but i end up with a VM that don't boot on the disk. i was thinking it was due to volumebasedcloning (wich seems to not be the case after checking the worker logs when adding a job through gui) so i changed my code to use diskbasedcloning:

1. converterStorageParams.cloningMode = "diskBasedCloning";
2.          ConverterComputerSpec computerSpec = new ConverterComputerSpec();
3.          computerSpec.location = Common.BuildLiveSourceLocation(_sourceName, _sourceUsername, _sourcePassword,
4.                                                                   _sourceOsType, false, "");
5.          ConverterComputerInfo computerInfo = _converterServer._converterService.ConverterQuery(_converterServer._converterServerContent.queryManager, computerSpec);
6.          //
7.          ConverterStorageParamsManagedTargetDiskParams targetdisk;
8.          string volumec="";
9.           for (int diskcount = 0; diskcount < computerInfo.osInfo.logicalVolumeInfo.Length; diskcount++)
10.          {
11.              if (computerInfo.osInfo.logicalVolumeInfo[diskcount].mountPoint[0] == "C:")
12.              {
13.                  volumec = computerInfo.osInfo.logicalVolumeInfo[diskcount].volumeId;
14.                  break;
15.              }
16.          }
17.           for (int diskcount2 = 0; diskcount2 < computerInfo.hardwareInfo.storage.volume.Length; diskcount2++)
18.          {
19.              if (computerInfo.hardwareInfo.storage.volume[diskcount2].volumeId == volumec)
20.              {
21.                  targetdisk = new ConverterStorageParamsManagedTargetDiskParams();
24.                  targetdisk.sourceDiskId = computerInfo.hardwareInfo.storage.volume[diskcount2].diskId[0];
25.                  targetdisk.datastoreName = "SnapServer";
26.                  converterStorageParams.targetDiskParams = new ConverterStorageParamsManagedTargetDiskParams[1];
27.                  converterStorageParams.targetDiskParams[0] = targetdisk;
28.                  break;
29.              }
30.          }
31.         converterStorageParams.vmxDatastoreName = "SnapServer";

wich give me a " TaskImpl has failed with MethodFault::Exception: vmodl.fault.InvalidArgument" error.

i'm kind of running in circle, can anyone point me to the right direction to achieve my goal?

thanks.