Getting error with request , any help?

Hi , im getting error with the request block on openbullet2 ,
error :
Sliced kalvelign123:kalvelignpass123 into:
USERNAME: kalvelign123
PASSWORD: kalvelignpass123
[IDLE] CompilationErrorException: (3,271): error CS0103: The name ‘USER’ does not exist in the current context
BOT ENDED AFTER 2403 ms WITH STATUS: ERROR

if any1 know why i get this error or if you want more detail pls add me on discord : Kalvelign#6947

you have to set your wordlist type for ex. if u set it to Credentials then u have to use USERNAME / PASSWORD