Failed to open the ZIP archive

Hello, I get this message:

“Failed to open the ZIP archive. If you uploaded a valid Fontello ZIP file, your host may be blocking this PHP function. Please get in touch with them.”

Of course I’m uploading a fontello zip file -already tried out in my localhost and it works. So I guess is this blocking php function from my host. But can you please be more specific on what php function I need to tell my host support to deal with? I don’t have a clue about that…

Thanks!