Yoast seo sitemap is not workin properly

I had an issue with my sitemap

When i opened the sitemap i was getting a white screen with no links as you can be seen in the image below

Then I have added exception code in minifying and browser cache in w3 total cache plugin

But still getting the same issue

Finally, i have tried deleting w3 cache plugin i got my problem solved but by not using the plugin my site speed is decreased

So i again installed it and getting the same issue
then i have asked the HostGator support to remove all the cache files of my site and they removed it
then i deactivated>uninstalled >and installed the w3 total cache plugin

after that, i had activated page, database and browser cache except for minification then everything working fine

but again i had an issue with site speed, if i don’t activate minification i cant increase my site if i activate it i may get the sitemap issues again

so, what should i do now

Waiting for valuable suggestions

The page I need help with: [log in to see the link]