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How to connect a GSM shield with an Arduino uno board? Answered

I connected the GSM shield and typed down a code of receiving an SMS, and it keeps showing an error about the serial port type..
I am not a professional person, I am working on my graduation project and can't go further due to this error..any one can help, please?

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You really need to show us your code.

Programs copied from the Internet rarely work without some effort.