There was an error building the STA table while building the Value Attribute Table (VAT).
Make sure you have enough disk space to hold the output STA table. Also make sure the output workspace is valid and has not been corrupted. Note that there is a limit on the number of grids that can exist in a workspace. If your workspace has a very large number of grids in it, either reduce any unneeded grids or use/create a different workspace.