This error is happening because the user might have copied something to the clipboard within Mechanical, and now the Mechanical process has hung and Windows can’t query it. Even if you have copied something onto clipboard, the Mechanical should ignore it and proceed with saving the data. Developers have made changes appropriate for this case in R19.1. You can use following workaround for this issue. There should be .rst files saved in the Workbench project directory. You can make copy of it and save in another folder for future purpose. Now in Mechanical Click on ‘Solution’. Go to ‘Tools’ menu at the top. Select ‘Read result File’. Read the file.rst file from the Workbench directory. You should be able to post process these results.