Task "Full backup" has failed

Hello, I have Acronis Backup and recovery 10 with licenses for 10 workstations and 1 license for a SBS 2003 server. I have two workstation machines on the network that i can not backup.The tasks fails every time throwing the following error "Failed to create volume snapshot".

The management server that i am running is Build 10.0.12708.

The agent for the workstations is Build 10.0.12708

I am trying to do a full backup of the hard drives.

Here is the log for the first workstation :

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1    Information    2/05/2011 7:08:34    Priority changed to Low.

2    Information    2/05/2011 7:22:15    Analyzing partition '0-0'...

3    Information    2/05/2011 7:22:20    Analyzing partition '1-1'...

4    Information    2/05/2011 7:22:55    Analyzing partition 'C:'...

5    Information    2/05/2011 7:23:00    Analyzing partition 'D:'...

6    Information    2/05/2011 7:23:35    Analyzing partition '1-1'...

7    Information    2/05/2011 7:26:20    Analyzing partition 'C:'...

8    Information    2/05/2011 7:29:22    Analyzing partition 'D:'...

9    Information    2/05/2011 7:39:53    Create Full Backup

From: Disk '1'

To file:    "file://storage1\Acronis\SpectroBackup_05.02.2011_.TIB"

Compression:      Normal

Exclude:    Files matching mask

Match criterion:  C:\Documents and Settings\All Users\Application Data\Acronis\BackupAndRecovery\MMS\Temp\acr14.tmp,

10    Information    2/05/2011 7:40:56    Pending operation 147 started: 'Creating partition image'.

11    Information    2/05/2011 7:40:56    Locking partition 1-1...

12    Information    2/05/2011 7:45:37    Pending operation 147 started: 'Creating partition image'.

13    Information    2/05/2011 7:45:43    Locking partition 0-0...

14    Error    2/05/2011 7:45:44    Operation with partition '0-0' was terminated.

Details:

Failed to create volume snapshot.

    Error code: 0x70021

    Tag: 0xA5695862AAF8E63A

Failed to start creating the volume snapshot.

    Error code: 0x10C442

    Tag: 0x14181C22EF45B04E

Unknown Win32 error

    Error code: 0xFFF0

    code = 2,147,754,758 (0x80042306)

    Tag: 0xBD28FDBD64EDB8BC

Additional info:

--------------------

Error code: 502

Module: 1

LineInfo: a164035b3ff39281

Fields:

Message: Operation with partition '0-0' was terminated.

Details:

Failed to create volume snapshot.

    Error code: 0x70021

    Tag: 0xA5695862AAF8E63A

Failed to start creating the volume snapshot.

    Error code: 0x10C442

    Tag: 0x14181C22EF45B04E

Unknown Win32 error

    Error code: 0xFFF0

    code = 2,147,754,758 (0x80042306)

    Tag: 0xBD28FDBD64EDB8BC

--------------------

Error code: 33

Module: 7

LineInfo: a5695862aaf8e63a

Fields:

Message: Unable to create volume snapshot

--------------------

Error code: 50242

Module: 16

LineInfo: 14181c22ef45b04e

Fields:

Message: Failed to start creating the volume snapshot.

--------------------

Error code: 65520

Module: 0

LineInfo: bd28fdbd64edb8bc

Fields:  code : 2147754758

Message: Unknown Win32 error

--------------------

Task 'Full backup' has failed on machine 'SpectroPc'.

Here is the log for the second machine where the full backup fails:

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mso-tstyle-colband-size:0;
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mso-style-qformat:yes;
mso-style-parent:"";
mso-padding-alt:0cm 5.4pt 0cm 5.4pt;
mso-para-margin:0cm;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman","serif";
mso-fareast-font-family:"Times New Roman";}

1    Information    1/05/2011 21:00:07    Priority changed to Low.

2    Information    1/05/2011 21:00:07    Analyzing partition '0-0'...

3    Information    1/05/2011 21:00:08    Analyzing partition 'C:'...

4    Information    1/05/2011 21:00:08    Analyzing partition '0-0'...

5    Information    1/05/2011 21:00:08    Analyzing partition 'D:'...

6    Information    1/05/2011 21:00:08    Analyzing partition 'C:'...

7    Information    1/05/2011 21:00:09    Analyzing partition 'D:'...

8    Information    1/05/2011 21:00:09    Create Full Backup

From: Disk '1', Disk '2'

To file:    "file://storage1\Acronis\FurnacesBackup_05.01.2011_.TIB"

Compression:      Normal

Exclude:    Files matching mask

Match criterion:  C:\Documents and Settings\All Users\Application Data\Acronis\BackupAndRecovery\MMS\Temp\acr264.tmp,

9    Information    1/05/2011 21:00:09    Pending operation 147 started: 'Creating partition image'.

10    Information    1/05/2011 21:00:10    Locking partition 0-0...

11    Error    1/05/2011 21:00:10    Operation with partition '0-0' was terminated.

Details:

Failed to create volume snapshot.

    Error code: 0x70021

    Tag: 0xA5695862AAF8E63A

Failed to start creating the volume snapshot.

    Error code: 0x10C442

    Tag: 0x14181C22EF45B04E

The device is not ready

    Error code: 0xFFF0

    code = 2.147.942.421 (0x80070015)

    Tag: 0xBD28FDBD64EDB8BC

Additional info:

--------------------

Error code: 502

Module: 1

LineInfo: a164035b3ff39281

Fields:

Message: Operation with partition '0-0' was terminated.

Details:

Failed to create volume snapshot.

    Error code: 0x70021

    Tag: 0xA5695862AAF8E63A

Failed to start creating the volume snapshot.

    Error code: 0x10C442

    Tag: 0x14181C22EF45B04E

The device is not ready

    Error code: 0xFFF0

    code = 2.147.942.421 (0x80070015)

    Tag: 0xBD28FDBD64EDB8BC

--------------------

Error code: 33

Module: 7

LineInfo: a5695862aaf8e63a

Fields:

Message: Unable to create volume snapshot

--------------------

Error code: 50242

Module: 16

LineInfo: 14181c22ef45b04e

Fields:

Message: Failed to start creating the volume snapshot.

--------------------

Error code: 65520

Module: 0

LineInfo: bd28fdbd64edb8bc

Fields:  code : 2147942421

Message: The device is not ready

--------------------

Task 'Full backup' has failed on machine 'furnaces'.

What to do? Thank you.