Theme error

Hi,

I am new to working on the development end of WordPress. I just installed a new WordPress site in localhost. Everything was working fine, even after I migrated it (with help) it was working just fine when it went live.

Then I changed the permalinks settings and I got this error: Fatal error: Call to undefined function get_post_format() in /home/performance/www/www/wp-content/themes/matala/loop.php on line 39

This is a theme error. I found another forum topic on this, but no resolution.

Here is the link to the blog: https://leticiarodriguezperforms.com/blog

All the pages are fine, but the blog won’t show up. And I’m getting the same error on the back end under Theme Options.