Failed to connect to database. This release of the GeoDatabase is either invalid or out of data. [Invalid Geodatabase release]

Error Message

In some instances, when attempting to add a database connection and open the database in ArcGIS Pro or ArcMap, the following error message is returned:

Error:   
Failed to connect to database. This release of the GeoDatabase is either invalid or out of data. [Invalid Geodatabase release]

Cause

The geodatabase is corrupted, or the data in the file geodatabase directory is deleted.

Solution or Workaround

To resolve the error, run the Recover File Geodatabase geoprocessing tool to recover the geodatabase data to enable viewing and utilizing of all the feature classes within the geodatabase successfully. For the guide to use the tool in ArcGIS Pro, refer to ArcGIS Pro: Recover File Geodatabase (Data Management). For ArcMap, refer to ArcMap: Recover File Geodatabase.

Note: 
To locate the Recover File Geodatabase tool in ArcGIS Pro, navigate to the Command Search (Alt + Q) dialog box on the top right of the page, and search for Recover File Geodatabase.

Note: 
Run the Recover File Geodatabase tool with the latest release of the ArcGIS Desktop software version to ensure the recovery of the data. For ArcGIS Pro, refer to ArcGIS Pro: Update ArcGIS Pro for more information on software updates. For ArcMap, refer to ArcMap: Existing ArcGIS Desktop users for more information on upgrading.