Hello Vedat,

Please ensure that the option to display PHP notices is disabled on your server.  If it is not then it can cause the issue you describe.

Your webhost will be able to assist you with this if you are unsure how to effect the change yourself.  Ask them to log any notices silently as opposed to sending the output to the screen.

Kind regards,

Paul

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@ Vedat
What currency do you use?

PayPal doesn't supports many local currencies...

It's $US 

It is fixed, thank you so much.

If you have Cpanel here is the steps.

You can turn off error reporting in cPanel -> Software -> PHP Selector -> Options -> Error_reporting.

Best

Vedat

http://www.gurtan.com

You're welcome, and thanks for letting us know