Hello, I have three different project files in my project. I am trying to organize my project files. For that, I added my custom classes to the src file but I have an issue, build folder path is missing. 

My code works when I don't add it below the src file (when it is in the same folder as the .ino file). How can I make the folder path continue after Release?

Error:
Compiling 'Master' for 'ESP32 Dev Module(esp32_esp32)'
Build Folder:
e"
 
xtensa-esp32-elf-g++*: error:
e\\Master.cpp: No such file or directory
 
xtensa-esp32-elf-g++*: fatal error: no input files
   compilation terminated
MasterMessageHandler.h:6: In file included from
MasterMessageHandler.cpp:1: from
Error compiling project sources
Build failed for project 'Master'
 
Master.h: 8:10: fatal error: WiFi.h: No such file or directory
   #include <WiFi.h>
   ^~~~~~~~
   compilation terminated

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Note: When I do not file the classes for the slave project (as in the image), it does not cause any problems.

Output