Any other in app purchase plugin?

I’m trying to use in-app-purchase but all i get are some exceptions as below

                                                       
java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:539)
at com.alexdisler.inapppurchases.SkuDetails.<init>(SkuDetails.java:47)
at com.alexdisler.inapppurchases.IabHelper.querySkuDetails(IabHelper.java:973)
at com.alexdisler.inapppurchases.IabHelper.queryInventory(IabHelper.java:575)
at com.alexdisler.inapppurchases.IabHelper.queryInventory(IabHelper.java:546)
at com.alexdisler.inapppurchases.IabHelper$2.run(IabHelper.java:652)
at java.lang.Thread.run(Thread.java:764)

and i’m tired of trying to find how to fix it.
can any one suggest any other working purchase plugin?