Android in-app billing: Can't start async operation because another async operation (is in progress)

Question

I am using the IabHelper utility classes, as recommended by Google\'s tutorial, and I\'m being hit hard by this error. Apparently IabHelper can not

Answer 1

if you code in fragment then you this code in IabHelper.java

void flagStartAsync(String operation) {
    if (mAsyncInProgress) {
        flagEndAsync();
    }
    if (mAsyncInProgress) throw new IllegalStateException("Can't start async operation (" +
            operation + ") because another async operation(" + mAsyncOperation + ") is in progress.");
    mAsyncOperation = operation;
    mAsyncInProgress = true;
    logDebug("Starting async operation: " + operation);
}