xml Fehler beim Import von Coupon Feed in xl Coupon (Pebas)

when I upload the xml in the xl coupon theme the following message comes up (

Import process is completed) everything stays empty … when I update the following comes up (** Sorry, there has been an error. **
File is empty. Please upload something more substantial. This error could also be caused by uploads being disabled in your php.ini file or by post_max_size being defined as smaller than upload_max_filesize in php.ini.) …
can someone help me what’s going on … greetings mcpn24