[Alan Anderson]

If it's the error I think it is, the "file permissions" wording is a red herring. The true problem is probably that it's trying to build the .rtexe in a nonexistent folder.

Open the project and find the "FRC Robot Boot-up Deployment" build specification. Right-click it and choose "Properties" from the popup menu.

In the "Information" category, check the Local destination directory to make sure it matches the actual location of the project on the new computer. It's likely that the user name part reflects the location on the old computer where the project was created. Fix it and try building again.