The code that I built is not displaying anything

[Gus-The-Forklift-Driver]

Hi , First of all I'm pretty new to c++ and don't know a lot about it. I'm have no problem when building, but when i try to run some code, I don't get anything on the matrix. I really don't know where the problem is coming from. Matrix : 64*32 driven by a Pi 4 here is the project I'm using (I just copied and pasted the example code and makefile and changed the names)

(also i tried running the python examples but the screen is extremely flickering and even the simple examples have trouble displaying)

UPDATE : I've run "make clean" and "make" in the default repo (rpi-rgb-led-matrix) and now running the examples doesn't do anything