Donation page having PCI error

A PCI error comes up for my donation form. The forms gateway is through Authorize.net.

Here is a discussion thread about a similar issue: https://www.jotform.com/answers/935252 

According to this knowledge base: https://support.authorize.net/authkb/index?page=content&id=A597  

"This can happen for four reasons:

1-You are attempting to process a type of transaction that your account is not designed to process. For example, you attempt to use a card swipe machine with an account that is enabled for Card Not Present transactions.

2-Your software integration is passing an incorrect value for the field x_market_type. If you are using a Retail account, x_market_type should be set to a value of "2". The integration guide for Card Present transactions can be found at http://www.authorize.net/support/CP_guide.pdf.

3-Your Merchant Service Provider may be incorrectly set up for this account.

4-The product type (SIC code) is incorrect for this account."

Please login to your Authorize.net account to see if any of those reasons apply to your case, you can also consult with your Authorize.net support.