reload
Reloads advertisement.
This method makes a repeat request to the ad server with the same adRequest. Keep in mind that when this method is called, adMetadata and adResponse becomes null and all processes, such as performTapEvent, will not be possible until this method completes successfully.
In addition, you cannot call this method again until the previous call has completed. Otherwise, you will receive an AdError.AdLoadingInProgress error.
Return
The result which contains reloaded Advertisement or AdError.