Everything was working perfectly until your latest update. The page now won’t load and I am getting this message from Bluehost.
Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
In this case, WordPress caught an error with your theme, XStore.
First, visit your website (https://www.plasticarmsdealer.com/) and check for any visible issues. Next, visit the page where the error was caught (https://www.plasticarmsdealer.com/wp-admin/customize.php?return=%2Fwp-admin%2Fplugins.php) and check for any visible issues.
Please contact your host for assistance with investigating this issue further.