Initial build failing with the first error "LEDMatrixGFX" was not declared in this scope

[mpandrex]

I'm probably doing something wrong. I skimmed through the DEMO and put my board in (nodemcu-32s)

[env:demo]
platform = espressif32
board = nodemcu-32s
monitor_speed = 115200
upload_speed = 921600
upload_port = COM3 ; This will vary by machine
build_flags = -DDEMO=1
-std=gnu++17
-Ofast

I have a whole slew of these errors:
{
"resource": "/d:/3D_Print/Printable_stuff/LED/NightDriverStrip-main/src/main.cpp",
"owner": "cpp",
"severity": 8,
"message": "'NTPTimeClient' has not been declared",
"startLineNumber": 185,
"startColumn": 16,
"endLineNumber": 185,
"endColumn": 16
}
Also for LEDMatrixGFX, LEDBufferManager, EffectMAnager, etc.

What am I doing wrong?
I've used other code from the "Dave's Garage - LED" series and been successful. But that series only runs effectively one string or image. I'm trying to have six spokes of LEDs that have slightly varying "fire" for a more natural effect. I was hoping that the NightDriver software was the solution for that. I'm trying to cut out all the webserver and wireless parts as they are not needed for this implementation. Later projects might fold that back in, but I'm just not ready for that yet.

Thanks for the help,
Mike