code: protected void onRPCError(int asyncHandle, int asyncError, String text) {
          IAsyncRPCEvent callback = getCallback(asyncHandle);
          
          if (callback != null) {
              callback.onRPCError(asyncHandle, asyncError, text);
          }
      }
docs: Invokes the callback for the specified handle when an error is encountered during an
  asynchronous RPC call.
  
  @param asyncHandle The unique handle for the asynchronous RPC call.
  @param asyncError The error code.
  @param text The error text.