I got this error suddenly , "Things don't appear to be working at the moment. Please try again later." Last week everything is working fine with my Rails-application. I am using 'gem 'paypal-sdk-adaptivepayments' for paypal payments. Tested at local with live paypal url and it is working good payment is successfully paid from my accound but the same is not working with Live site. I check post and redirect urls both are same for live and local and I change paypal post and return url to live site url at local it is working fine but the problem is only at live site.