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ERROR in processing payment in checkout

ERROR in processing payment in checkout

good day


Im having problem in onepage checkout when i try to select payment and click on continue button. it will not go to step3 and will redirect to cart.



I try to view console in google chrome and here is the error



POST 500 (Internal Server Error)

request @ prototype.js:1530

initialize @ prototype.js:1495

(anonymous function) @ prototype.js:429

klass @ prototype.js:101

save @ opcheckout.js:775

onclick @ (index):672

 Navigated to


can anyone try to help me on this


I have seen many articles about this and try all of they said and nothing happens


Im using magento Community edition and groupdeals extension template