I wrote a code to drop a random number, but an error occurs, who knows what's wrong?

Question

Python

Here is the code itself:

@client.command( pass_context = True)
async def rolldice(self, ctx):
n = random.randrange(1, 6)
await stx.send(n)

Mistake:

Answer 1

Written stx instead of ctx...

Answer 2

You have written in the console: the name 'stx' is not defined