I get this error when I run my Gwt app

Found widget in an HTML context

Here is a snippet of the xml that it complains about:

...
    `<g:HTML ui:field="localPanel">`

    `<fieldset>`
        `<legend>Local</legend>`
        `<label for="btn" >BTN:</label><input type="text" ui:field="btn" class="txtbx numeric" maxlength="10" name='btn'/>`
        `<label for="stdprt">SDT PRT:</label><input type="text" ui:field="stdprt" class="txtbx" readonly="readonly" name='stdPrt'/>`
        `<label for="rateArea">Rate Area:</label><input type="text" ui:field="ratearea" class="txtbx" readonly="readonly" name='rateArea'/>`
        `<br/>`
        `<label for="deleteDigits">Delete Digits:</label><g:ListBox ui:field='deletedigs' class="dropdownbx" name='deleteDigits'/>`
    `</fieldset>`
    `</g:HTML>`
    `<g:Button ui:field="submit2">Submit</g:Button>`
    `</g:HTMLPanel>`

</ui:UiBinder>