pack() function

[B1N4R1]

So I have this errors:
Warning: pack(): Type H: illegal hex digit R in C:\xampp\htdocs\legacy-master\index.php on line 192

Warning: pack(): Type H: illegal hex digit T in C:\xampp\htdocs\legacy-master\index.php on line 192

And I'm quite sure it's because of this line in the code:

$key = pack("H*", 'REDACTED');

Thing is, what do I have to change there for it to work?

I would appreciate if anyone was kind enough to explain me

Thanks!

[augustresende]

You need to generate a hex key to put here (encrypt passwords)

It is not an error, just warning.