71603: Acronis Cyber Protect: Agent installation fails with "Failed to add user. A null reference pointer was passed to the stub"

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Last update: 10-01-2023


  1. You are trying to install an agent
  2. The installation fails with "Fatal error during installation"
  3. When analyzing the installation log with MSI technology, you see the error "A null reference pointer was passed to the stub"



The mentioned user doesn't have enough rights on the affected machine.


To resolve the issue, manually add the user to the group 'Backup Operators':

  1. Click Search, type in compmgmt.msc and press Enter.
  2. Computer Management opens. Navigate to Local Users and Groups, click Groups, then double-click Backup Operators on in the right hand side.
  3. In the Properties window, click Add.
  4. In Enter the object names to select, type the affected user' username and click Check names.
  5. Click OK and save changes.

For more information, check this Acronis Article

More information

If the suggested solution didn't resolve the issue, follow the instructions in the article: Required managed machine service user rights