Importing test cases from zephyr squad to zephyr scale

Hello, 

I'm, trying to import test cases from  zephyr squad to zephyr scale. 

Steps below, 

1. zephyr squad -> Went to the test cycles and exported test cases to .cvs file

2. zephyr scale -> Under test , import from .csv 

this always gives me an error 

"The uploaded file could not be parsed. It seems to have invalid content.
Try again by uploading a valid file."

i have even tried the sample test case given in the below link to import, getting the same error

https://support.smartbear.com/zephyr-scale-server/docs/test-cases/import/from-csv.html?sbsearch=import#_before_you_import_format_your_csv_file