RETS Status code = 20200: Unknown Query Field [LFD_INTERNETSITES_38]

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I am frustrated with your website....
What is the use if I am not able to post a question?????? I tried to post my question 10 times, I made 2 separate accounts and each time the following message occurs: "Spam was detected on your post, sorry for if this is a mistake".
I need urgent assistance.
We have a RETS Feed with User Login - BrokermintGoo
The URL we're using is: http://maxebrdi-rets.paragonrels.com/...
When trying to run a query from all classes except Residential we are returning the following error:
RETS Status code = 20200: Unknown Query Field [LFD_INTERNETSITES_38].
However, I am not finding the field L_IdxInclude within the class as an optional field.
Please advise ASAP!