Disallowed attribute in HTML tag ‘col’

Hello,

I have received following error report from google suit.

New Accelerated Mobile Pages issue detected for site https://onlinesales.ai/
To owner of https://onlinesales.ai/,

Search Console has identified that your site is affected by 1 new Accelerated Mobile Pages related issue. This means that Accelerated Mobile Pages may be negatively affected in Google Search results. We encourage you to fix this issue.

New issue found:
<strong>Disallowed attribute in HTML tag 'col'</strong> 

I am not able to understand what wrong I did? Any solution to fix this ? Please help, I would really appreciate your help,

Thanks in advance

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