I need help please

I need help pleaseI need help pleaseok so im trying to cash in my points (or coins ) it says 3000 coins  = 5 $ gift xard well i have over 5000 but... every time ive tried cashing in the coins the error message comes up im so confused  can someone please explain what im not understanding this is the first time trying to cash in

 

Thanks in advance I need help please

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