Paypal returned response giving problem

[eluser]vikas.fourorange[/eluser]
Hi,

I am working on an application in which I have integrated Paypal. while returning from the paypal , I mean at success page I am getting

Code:

An Error Was Encountered
The action you have requested is not allowed.

1. My Success url is directly accessible from the url and printing "test" which is the only thing I echoed in Success function.

2. This errors only occurs while returning from paypal.

I guess this is some problem with CI_TOKEN. I tried to send the ci_token to paypal but still giving the same error.

Please help how to remove this.

Thanks