reCapcha Error Help

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0

Hello,
First time I am using this plugin on my website.
After installation I activated recapcha addon.
Put my public and private key for recapcha which is created in past.
But I am not able to submit any questions. It says: reCAPTCHA is not valid, please try again
I tried many time even if I put right capcha it still shows same error.
Any help?