In app billing in android

I am getting problem when run sample application of in app billing in device like told me to update market app and i 开发者_StackOverflow中文版have already the install market app of version 2.3.4 .If any one have hint how to do that please provide solution

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The only other reason I could find in the documentation was

The synchronous response for a CHECK_BILLING_SUPPORTED request provides a Bundle with a server response code. A RESULT_OK response code indicates that in-app billing is supported; a RESULT_BILLING_UNAVAILABLE response code indicates that in-app billing is unavailable because the in-app billing API version you specified is unrecognized or the user is not eligible to make in-app purchases (for example, the user resides in a country that does not allow in-app billing). A SERVER_ERROR can also be returned, indicating that there was a problem with the Android Market server.

But I cannot find a list of these countries, you would assume it was the same as those that can buy paid apps:

https://market.android.com/support/bin/answer.py?answer=143779