program upload error when ethernet shield plugged

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sorry if post in wrong category. bought ethernet shield, when plugged shield arduino, program cannot uploaded.
if remove shield can upload program , can run, after shield plugged again program doesnt run.
arduino ide displays
code: [select]

avrdude: recv:
avrdude: stk500v2_receivemessage(): timeout
avrdude: stk500v2_getsync(): timeout communicating programmer


the ethernet shield labelled hanrun hr911105a 16/02

please post code using, , give link shield.


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