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