010040: Unable to delete grid <value>.
Description
There was a problem deleting the specified grid raster. If the grid is being accessed by an ArcMap or ArcCatalog session, it will have a file lock placed on it and thus cannot be deleted. A file lock will also occur of the grid folder is being accessed by a system file explorer.
Solution
Check that the specified grid does exist at the location identified.
Make sure that the grid is not being accessed by another ArcGIS session or being viewed in a file browser.
Check that you have the appropriate permissions for the workspace.