SyntaxError: Unexpected token < in JSON at position 0" WordPress Error-SOLVED

I have WordPress+Woocommerce store setup for my website www.wayanad.net
Woocommerce signup and Checkout was working fine until I installed W3 Total cache plugin. But after installing that plugin, I noticed that the checkout was not successful using the Payumoney payment gateway. The error shown was SyntaxError: Unexpected token < in JSON at position 0..

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