In app purchase Receipt data to base64 becoming null in iOS 9 beta?

Below is my code to get base 64 string from receipt data, but some how its coming up as null in iOS 9 beta 3.

NSURL *receiptURL = [[NSBundle mainBundle] appStoreReceiptURL];

NSData *receipt = [NSData dataWithContentsOfURL:receiptURL];

if (!receipt) { / No local receipt -- handle the error. */

NSLog(@"receipt is nil");

}

else {

NSString *base64String = [receipt base64EncodedStringWithOptions:0];

NSLog(@"receipt base 64:%@",base64String);

}

And here is the log:

receipt base 64:(null)

I am getting other transaction data fine, just receipt is getting as null

<transactions><transaction><error></error><pid>ss_10106</pid><q>1</q><date>1435589871.000000</date><id>1000000161261453</id><receipt>(null)</receipt><state>1</state><error_code>-1</error_code><og> </og></transaction></transactions>

Can anybody suggest whats going on?