Cannot download (or publish from file) - Migrate skype2015 to skype for business 2019

I have the skype4b 2015. I want to migrate to 2019

I login to the frontend skype 2019 new  and download the old topology from skype4b 2015. The error like the picture

I download topology file from skype4b 2015 and open from skype4b 2019. And publish but the error is same

Please support me!

Thank!