Index was out of range. Must be non-negative and less than the size of the collection. (4250121)

Index was out of range. Must be non-negative and less than the size of the collection.

After an In-Place upgrade of Active Roles, the following errors are observed in the Configuration Center after being prompted to upgrade the Web Interface sites configuration:

"Unable to retrieve Web Interface site configuration objects.
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: Index"

The sites function normally, but the Configuration Center repeatedly prompts for upgrades.

Clear the IsInPlaceUpgrade flag in the Registry.

1. Launch the Registry Editor
2. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\One Identity\Active Roles\Configuration\Web
3. Set the IsInPlaceUpgrade DWORD to 0

 

​Restart the Configuration Center to verify if the problem is resolved.