"Not in Stress" Reason found BUT Who can solve it ?

Today self-confidence is back :-) not even this compile. 

#include <IOTAppStory.h> 
#include "EspMQTTClient.h" 
void setup(){} 
void loop(){} 

As common factor is ESP Async WebServer it seems to me as some “#pragma once” are missing. 
If not maybee one of the other 2 developers has made changes to the lib . So who to ask?
I tried solve a year ago and made the problem even bigger, it had been better if I asked professional's back then😇

Bjorn