Veeam Hyper-V backups stops working after “Spring Update” KB 2919355

A costumer contacted me since all suddenly his Veeam Hyper-V backup jobs failed.
The error stated the following:

Processing %VMNAME% Error: Client error: The system cannot find the file specified.
Failed to open file [\?GLOBALROOTDeviceCSV … AutoRecovery.avhdx] in readonly mode.

First I assumed that there was something wrong with the Clustering, but after a little troubleshooting i found out that the Cluster aware updating was enabled and that it had automatically installed the new spring update  KB 2919355

Well this is an problem if your run the latest version of Veeam Backup and replication version 7.0.0.839.
Veeam has released and hotfix KB 1863 that fixes both this issue and another one.
The hotfix includes a couple of files. You need to stop some services and replace VeeamHvIntegrationSvc.exe VeeamHvSnapshotCreator.exe  on ALL Hyper-V hosts. Before you replace two dll files on the server that hosts the Veeam Console.

For more info:

http://www.veeam.com/kb1863