Oh, it seems that Haxchi cannot load the RPX version of HBLauncher, according to official thread of Haxchi:
https://gbatemp.net/threads/haxchi-v2-5u2-a-persistent-wiiu-hack.451071/
"This also ONLY LOADS THE .ELF VERSION OF THE HOMBEBREW LAUNCHER which as of right now is v1.4 so make sure to keep that on your sd card or you will just get error -5 when starting your haxchi channel. "
https://gbatemp.net/threads/haxchi-v2-5u2-a-persistent-wiiu-hack.451071/
"This also ONLY LOADS THE .ELF VERSION OF THE HOMBEBREW LAUNCHER which as of right now is v1.4 so make sure to keep that on your sd card or you will just get error -5 when starting your haxchi channel. "