Thoughts on what could cause this error?

"type":"error.SuiteScriptError","name":"SSS_INVALID_TYPE_ARG","message":"You have entered an invalid type argument: INLINEHTML"

serverWidget.FieldType lists limitations

Ok, so inline HTML won’t work with sublist.addField… How can I get around this? I have a summary page that I need to implement drill down using a link and sending a parameter to the GET request.