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Return argument has an invalid type


Veeam Backup Enterprise Manager fails to collect data from a Veeam Backup server with the following error:

Return argument has an invalid type.

The following error can be seen in VeeamBES.log:

[timestamp] Info     Reporting data were successfully collected from the server [server.local]

[timestamp] Error    Interrupting collect session. Return argument has an invalid type.

[timestamp] Error    Unable to collect data from Veeam Backup Server

[timestamp] Error    System.InvalidCastException: Return argument has an invalid type.


The version of Veeam Backup Enterprise Manager differs from the version of Veeam Backup & Replication.


Make sure that Veeam Backup Enterprise Manager and Veeam Backup server have the same version. Veeam Backup Enterprise Manager can only collect data from backup servers of the same version.

Veeam Backup & Replication
5.x, 6.x
Last Modified:
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