When i building my project, an error appear, it here

I don’t know how to fix it. Help me, pls?
When i building my project, an error appear, it here

I don’t know how to fix it. Help me, pls?
click “try again”, It will either stop or continue, Anyhow Quit , Restart unity and check whats up with the model if its still a problem delete the model , or re-import the model.
occasionally this happens, Unity has a Lock on the FileHandle and has not had time to close the handle on one of the files.
delete files from inside unity’s editor never from the Explorer.
Good Luck.
Thanks runner, I did fix it.