Snapshot dashboard is showing 500 error

When I visit snapshot dashboard page, it shows 500 error page.

Error in debug: > PHP Fatal error: Out of memory (allocated 180097024) (tried to allocate 2101248 bytes) in /home/sites/irishairandbeauty.co.uk/public_html/wp-includes/functions.php on line 435

Though I have added WP_MEMORY_LIMIT and WP_MAX_MEMORY_LIMIT but didn’t work.