p2p connection failed - likely incorrect p2p magic value

Hi and I'm sorry for my bad english.

I have a question regarding peerMagic value. I have read the install guide, I have read on every site in Google and nobody explain with clarity which magic value must be used on file litecoin.json. I have the following error mesagge when I run node init.js "p2p connection failed - likely incorrect p2p magic value". I'm trying peerMagic numbers "fbc0b6db" and peerMagicTestnet "fcc1b7dc" or peerMagicTestnet "fdd2c8f1". I'm trying the values suggested on installation guide and also with the values pchMessageStart from file chainparams.cpp but without success.

My installation:
Debian 10
Litecoin Core
Redis
NOMP with Node v8.17.0

I read a lot of questions about this issue but without answer. It sounds like a secret that nobody wants to reveal.

Everything else run fine but I can't solve this issue.

Could some one help me please.

Thanks in advance.