Data Export tool show only dashboard. No docType and File Type shown

Anyone help me to tell why this is happen to me?

Does your user have permission to access Imp/Exp?

yes I have permissions to access import/export tool. I already export items so many times but from last day dont show doctype and file-type. Whats the possible error regarding this issue and how to solve it?

You might need to do

bench --site your-site-name clear-cache

Problem is resolved. Thanks man you are so genius again thanks