---Upload files---
Widget file was not uploaded. Error: File is empty. Please upload something more substantial.

---Upload files---
Customizer file was not uploaded. Error: File is empty. Please upload something more substantial.

---Upload files---
Redux file was not uploaded. Error: File is empty. Please upload something more substantial.

---Upload files---
The import files were successfully uploaded!
Initial max execution time = 30
Files info:
Site URL = https://radiospektrumtmp.up.krakow.pl
Data file = /home/wwwmultisite2/public_html/wp-content/uploads/sites/20/2019/01/radiospektrum.wordpress.2019-01-22.xml
Widget file = not defined!
Customizer file = not defined!
Redux files:
not defined!

------
New AJAX call!
[ERROR] Failed to import "One Click Demo Import - log_file_2018-12-07__20-19-39" (Media)