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Q: Error when trying to upload a homework assignment to Stellar

When I try to upload a homework assignment in Stellar, I get an error message that says I can either choose a file or type in the text box, but not both. I haven't typed anything in the text box. How can I stop this from happening?

This seems to affect users running Mozilla Firefox with the Highlighter add-on.


This could be caused by the Highlighter ( Firefox add-on. You can test whether or not this is the problem by clicking the Source link that appears above the textbox for homework submission. If you have anything in the textbox after clicking the source button, then it's likely an add-on is putting something into that space.

The text that appears because of the highlighter add-on may look like the following:

<input type="hidden" id="gwProxy"><!--Session data--></input><input
type="hidden" id="jsProxy" onclick="jsCall();" />
<div id="refHTML">&nbsp;</div>

If you have this text, please try disabling or removing the Highlighter add-on. You can remove the add-on by going to Tools=>Add-ons.

Keeping the add-on

If you find this particular add-on to be very useful and want to keep it on your computer you can either:

  • Use another web browser to access the Stellar homework submission site. IS&T supports Internet Explorer on Windows and Safari on OS X. Please note that you will have to install certificates in either of these web browsers if you haven't do so already. Your MIT Personal certificate installed in Mozilla Firefox will not work in IE or Safari.
  • Choose to leave the add-on running and just remove the hidden input tag when you submit your homework assignments. To do this, click the Source button and delete all of the text in the textbox before submitting the assignment.

IS&T Contributions

Documentation and information provided by IS&T staff members

Last Modified:

August 01, 2016

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