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JavaScript errors when using the Google App Engine channel API and development server

I am writing a Python GAE application that uses the channel API, and everything works fine, except that I get non-fatal browser errors in the Firefox error console when using the development server. This is essentially the same with every Channel API application, so I will show what I see with the Channel Tac Toe sample application.

It starts with a syntax error, where the source code is always shown as the number "1":

Error: syntax error
Source File: http://localhost:8080/_ah/channel/dev?command=connect&channel=channel-2053758219-1329727351-185804764220139124118185804764220139124118
Line: 1, Column: 1
Source Code:1

Further, this is an “incorrect” error (only in the Tac Toe channel):

Error: not well-formed
Source File: http://localhost:8080/_ah/channel/dev?command=poll&channel=channel-2053758219-1329727351-185804764220139124118185804764220139124118&client=1
Line: 1, Column: 1
Source Code:{"winner": null, "userX": "185804764220139124118", "moveX": true, "winningBoard": null, "board": "         ", "userO": ""}

Then I get an endless series of "no items" errors, about three seconds:

Error: no element found
Source File: http://localhost:8080/_ah/channel/dev?command=poll&channel=channel-2053758219-1329727351-185804764220139124118185804764220139124118&client=1
Line: 1

After that, the Tac Toe channel behaves badly (both sides want to be an X player), although my actual application works without problems.

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