I believe I have found the problem. When I look at “preview” I noticed the last two parenthsis )) and not underlined in red on the URL when the page loads.
http://memory.loc.gov/cgi-bin/query/r?ammem/mgw:@field(DOCID+@lit(gw110081))
Load the page as is, then when you get the error warning go to the URL and add the missing )), then hit enter.
It should load.
Thanks. That solved the problem.