HELP-PROBLEM

I have a problem.

I want to export my local site to import to a public site with a All in one WP migration. When the import ends i got the messages

”Unable to import. Unable to open file for reading. File:…….. ”

Also i see some very helpful tutorial from youtube to do this proccess with backups but again i got the messages

”Unable to upload.Unable to make temporary file for upload.

Could you help me to solve this problem please