Thank you for reaching out to us. Could you please check if you have replaced the quote list page with another page in the “Select Quote List Page” option within the customized quote form settings? Also, did the page load correctly before?
Thank you for getting back to us. Have you installed any new plugins or made changes to your site’s theme recently? If so, please run a plugin and theme compatibility test to check for any issues. According to your email, our plugin was working fine until just recently. Additionally, I recommend contacting us through the commercial plugin support link so we can gather more information and resolve the issue.