Invalid merge field message although I am using right field names in word document

Hi Guys

I am writing the following code to print off the word letters but anyhow its saying Invalid merge field, "You want to remove it or replace it"

But I am using right field names in the document. I have checked many times and they are right so not sure why its giving me invalid merge field message every time I run the code.

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Please see attached the word document as well. In the table there are following fields:
Username,Surname,PolicyNo,Printpoolno,QADD,QAMM,QAYYYY

I hope anyone can help me in this.

Thanks