http server and mqtt client problem

Maybe a lack of memory to run, or free space in which to save your program. There is quite a lot going on.

I would start by removing the save() instruction and seeing if I can upload the sketch. Then I'd try to save the sketch by keying save() in the console on left of Wen IDE, and if both ok, try run the sketch - and for this it is useful to wrap all your init code in a named function you can specify as the E.on("init", ...) callback, instead of using anonymous function. You can them comment out, and call your init function from the console.