Android In-app Billing Getting Dialog Like “item Not Found”

I am working on in-app billing. I have done all the steps. When I run my signed apk, and after clicking on buy button I am getting this dialog 'item not found'. Also after clicking

Solution 1:

Did add the following line to your Proguard configuration file:

-keep class com.android.vending.billing.**

Solution 2:

Add inapp products in your developer account for that application, and use the same SKU. It will resolve the issue.