BOT don't catch commands
my bot don't catch commands, what i try to mean is that when i use for example: -ping command it doesn't say anything, i don't know what i'm doing BAD 'cause i'm watching a video, can someone help me? please 
index.js
ping.js
someone help me asap please! i don't know what i'm doing bad :/

index.js
"@sapphire/framework": "^3.1.4",
"discord.js": "^13.12.0"
ping.js
someone help me asap please! i don't know what i'm doing bad :/

