Description of problem:
In the Admin Portal of RHEV-M I tried to add a VM to the new install of RHEV-M 3.5. The "Change CD" command in RHEV-M 3.5 results in "Internal Engine Error." 

Version-Release number of selected component (if applicable):
RHEV-M 3.5 (vt4/el6)
RHEL - 6.5 Host
W2K8R2 - Guest

How reproducible:
100%

Steps to Reproduce:
1.
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Actual results:


Expected results:


Additional info:
I got this when I did a tail of the engine.log file

2014-10-06 08:52:17,044 INFO  [org.ovirt.engine.core.bll.ChangeDiskCommand] (ajp-/127.0.0.1:8702-8) [597467d7] Running command: ChangeDiskCommand internal: false. Entities affected :  ID: dbde9c98-fb5f-4a52-84ee-c798e3b8a2f9 Type: VMAction group CHANGE_VM_CD with role type USER
2014-10-06 08:52:17,047 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.IsoPrefixVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] START, IsoPrefixVDSCommand(HostName = kaitan, HostId = bb1b8cb9-1bf4-47f4-a403-b17c230fdfe6, storagePoolId=00000002-0002-0002-0002-000000000332), log id: 6df88be6
2014-10-06 08:52:17,047 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.IsoPrefixVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] FINISH, IsoPrefixVDSCommand, return: /rhev/data-center/mnt/10.19.168.10:_rhev_isos/e1a50b62-693a-412c-bffd-2c9147e4c5b4/images/11111111-1111-1111-1111-111111111111, log id: 6df88be6
2014-10-06 08:52:17,048 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.ChangeDiskVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] START, ChangeDiskVDSCommand(HostName = kaitan, HostId = bb1b8cb9-1bf4-47f4-a403-b17c230fdfe6, vmId=dbde9c98-fb5f-4a52-84ee-c798e3b8a2f9, diskPath=/rhev/data-center/mnt/10.19.168.10:_rhev_isos/e1a50b62-693a-412c-bffd-2c9147e4c5b4/images/11111111-1111-1111-1111-111111111111/RHEV-toolsSetup_3.5_4.iso), log id: 6963e709
2014-10-06 08:52:17,160 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.ChangeDiskVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] Failed in ChangeDiskVDS method, for vds: kaitan; host: 10.19.168.18
2014-10-06 08:52:17,160 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.ChangeDiskVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] Command ChangeDiskVDSCommand(HostName = kaitan, HostId = bb1b8cb9-1bf4-47f4-a403-b17c230fdfe6, vmId=dbde9c98-fb5f-4a52-84ee-c798e3b8a2f9, diskPath=/rhev/data-center/mnt/10.19.168.10:_rhev_isos/e1a50b62-693a-412c-bffd-2c9147e4c5b4/images/11111111-1111-1111-1111-111111111111/RHEV-toolsSetup_3.5_4.iso) execution failed. Exception: NullPointerException: 
2014-10-06 08:52:17,160 INFO  [org.ovirt.engine.core.vdsbroker.vdsbroker.ChangeDiskVDSCommand] (ajp-/127.0.0.1:8702-8) [597467d7] FINISH, ChangeDiskVDSCommand, log id: 6963e709
2014-10-06 08:52:17,161 ERROR [org.ovirt.engine.core.bll.ChangeDiskCommand] (ajp-/127.0.0.1:8702-8) [597467d7] Command org.ovirt.engine.core.bll.ChangeDiskCommand throw Vdc Bll exception. With error message VdcBLLException: java.lang.NullPointerException (Failed with error ENGINE and code 5001)
2014-10-06 08:52:17,163 ERROR [org.ovirt.engine.core.bll.ChangeDiskCommand] (ajp-/127.0.0.1:8702-8) [597467d7] Transaction rolled-back for command: org.ovirt.engine.core.bll.ChangeDiskCommand.
2014-10-06 08:52:17,176 ERROR [org.ovirt.engine.core.dal.dbbroker.auditloghandling.AuditLogDirector] (ajp-/127.0.0.1:8702-8) [597467d7] Correlation ID: 597467d7, Job ID: f87f2fee-76f7-4e35-9afc-e10114b4e0d8, Call Stack: null, Custom Event ID: -1, Message: Failed to change disk in VM Win2K8R2 (Host: kaitan, User: rhevadmin).