Now check the top box which selects all the files and then click on delete symbol highlighted in the image
An error occurred while deleting “models”.
A directory must be empty before being deleted.
Once you delete on the top right corner before Grade, you notice a 
Clicking on that will give you the below image
At this time click reboot
Not an issue, sometimes not all files will get deleted.
Once rebooting is done. Click on again, at this time click on Get Latest Version
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Now Once you click on Get latest version, you get the below image
Here you click Update Lab.
Once you have Updated Lab, you will have a fresh copy of your assignment.
All the best!!!
Keep learning!!
And remember to create a new topic whenever you encounter any issue.
Regards
DP
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Thanks a lot. Now I will redo the assignment
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at anytime you are not able to get through assignment, use the search tool here, to look for similar threads and solutions, so you can get through your error or codes. if still unable to get a solution, create a new topics with explanation I mentioned before.
Happy to help!!
regards
dp
But still even after doing everything you told, same error still exists
please create a new topic with the screenshot of the error you are encountering. make sure you share only the error part and not share any codes from the grade cell which you wrote as it is part of grading assignment. i am closing this thread.