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Acronis Backup and Recovery 11 Advanced server - Error 65520

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Hi all,

I keep getting the below error on my windows 2003 server when trying to start a backup.

I have tried reinstallation, reboots, start/stop services etc to no avail.
The file does exist locally and is being run as a service.

Failed to create the process.
Additional info:
Error code: 10
Module: 300
LineInfo: fd666990853c6085
Fields: $module : C:\Program Files\Acronis\BackupAndRecovery\mms.exe
Message: Failed to create the process.
Error code: 65520
Module: 0
LineInfo: bd28fdbd64edb8bc
Fields: code : 2147942593
Message: %1 is not a valid Win32 application

Any help is appreciated,


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I get the exact errorcode and errormessage.

is there any solution for this ?

Gavin, did you get a fix for this.

I hope anyone has a solution for me.


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Is there file named "program" (or maybe folder) in the root of C: disk ? If it is there, rename it. It is picked instead of some executable in C:\Program Files\... when starting child process.

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Hi Dev-anon

our customer has checked the root folder, and indead he found an file named program.
He renamed it and started the backup job with a 100% result. !!!

Thanks for your support, our customer is happy with the result.

Gtrz Arthur

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same Problem here, but there is no file or Folder on our SBS2011 called "program".
the 65520 Comes on third place after 50242 + 50281.
Havn't yet found out where the Problem is but the backup was created with warnings that the VSS snapshot could not be started.

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LSK Technik, please post the entire error message. 65520 is just a 'windows error' that can very often be in the error stack, so it may be completely unrelated.