Tast failed: 'Failed to create a backup'

Hello all! i have been backupping my systems correctly for the past couple years but all of the sudden i get the following message:
Task 'Back up sbs' failed: 'Failed to create a backup.
Additional info:
--------------------
Error code: 3
Module: 435
LineInfo: 555b5abba095034c
Fields:
Message: Failed to create a backup.
--------------------
Error code: 32786
Module: 114
LineInfo: 28314c961de7d337
Fields:
Message: Failed to prepare for backing up.
--------------------
Error code: 353
Module: 149
LineInfo: a71592046cb2c5f6
Fields:
Message: Failed to back up the group.
--------------------
Error code: 2
Module: 218
LineInfo: 338a407ad20e0987
Fields:
Message: Error occurred while running the backup and recovery engine.
--------------------
Error code: 537
Module: 149
LineInfo: fc2924f06484b5f1
Fields:
Message: Meta collection during application-aware backup failed.
--------------------
Error code: 2002
Module: 538
LineInfo: 2a7f716abaaab050
Fields:
Message: Error occured while loading applications through Vm proxy
--------------------
Error code: 239
Module: 83
LineInfo: b7e5b06ccbf4eac0
Fields:
Message: Failed to execute agent 'cscript /NoLogo GuestAgent.vbs' with parameters '{ }'.
--------------------
Error code: 240
Module: 83
LineInfo: a83807079d0431a
Fields:
Message: Failed to run script 'cd "C:\Users\ADMINI~1\AppData\Local\Temp\FDB97BBA-63DA-4E92-BB28-EB5FFB936183\" && cscript /NoLogo GuestAgent.vbs >1B789FD7-1DEF-429E-B125-AD801EE947B3'.
--------------------
Error code: 139
Module: 83
LineInfo: a83807079d04314
Fields: RetCode : 1
Message:
--------------------'.
and another one:
The operation has failed.
Additional info:
--------------------
Error code: 26
Module: 100
LineInfo: 48afbd3608a410ca
Fields:
Message: The operation has failed.
--------------------
Error code: 537
Module: 149
LineInfo: fc2924f06484b5f1
Fields:
Message: Meta collection during application-aware backup failed.
--------------------
Error code: 2002
Module: 538
LineInfo: 2a7f716abaaab050
Fields:
Message: Error occured while loading applications through Vm proxy
--------------------
Error code: 239
Module: 83
LineInfo: b7e5b06ccbf4eac0
Fields:
Message: Failed to execute agent 'cscript /NoLogo GuestAgent.vbs' with parameters '{ }'.
--------------------
Error code: 240
Module: 83
LineInfo: a83807079d0431a
Fields:
Message: Failed to run script 'cd "C:\Users\ADMINI~1\AppData\Local\Temp\FDB97BBA-63DA-4E92-BB28-EB5FFB936183\" && cscript /NoLogo GuestAgent.vbs >1B789FD7-1DEF-429E-B125-AD801EE947B3'.
--------------------
Error code: 139
Module: 83
LineInfo: a83807079d04314
Fields: RetCode : 1
Message:
--------------------
How can i resolve this error?
Best regards,
Vasily
Acronis Virtualization Program Manager
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