Ruby Fiddle on Windows

[KING SABRI]

Hello guys
I need help in `Fiddle` it's really missing documentation and examples

I have the following code (
https://gist.github.com/KINGSABRI/1871e748b51b6ef5c8f61a49a909b8c3)
The full error is right down the code
I'm trying to call Windows APIs and inject a raw code (shellcode) to run it
directly in the memory
I don't know if this error is a Ruby bug or there's an issue in my code

OS: Windows 10 - 32bit
Ruby version: 2.5.1p57

A python version above each line.
I'm really shocked that I needed more than 29 lines to deal with C library
for my case which is converting a 6-lines python script!.

Note: I don't want to use any external gems

Thanks