i think issue is in your this path C:\Users\Devi\Documents\Arduino\test_2\test_2.ino\test_2.ino.ino:1:29: fatal error: Adafruit_NeoPixel:

make new arduino file and copy the same code and save it on other folder on desktop or other drive then compile it

i think issue is in your this path C:\Users\Devi\Documents\Arduino\test_2\test_2.ino\test_2.ino.ino:1:29: fatal error: Adafruit_NeoPixel:

make new arduino file and copy the same code and save it on other folder on desktop or other drive then compile it

Compilation I compiled you same code and my stored path of .ino file is C:\Users\Muhammad Hassaan\Documents\Arduino\sketch_mar04a