Paper jam (077-104) on Dell 2130cn printer when Duplexer installed.

I just installed a duplexer for the Dell 2130cn printer I have.  It paper jams all the time with the duplexer installed with a 077-104 error.  Without the duplexer everything works fine.  I re-seated the duplexer and fuser assemby without any change.  The duplexer shows up on the status when installed.  Is this a case of just a defective duplexer?

 

Thanks.

 

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