Stuck: Illegal MML

Well, I'm doing a Platformer game. I'm planning the physics. But I have a problem, an illegal MML on my BGM_DATA file. This is what is said: Illegal MML in 1:4(BGMSETD:2) :12[ {PC0}]T180{C0= V100 L16 F#C#>F#<C# Duplicate macro definition (in Track 12) Any help? Please?

{C0=...} defines a macro called C0, which you then use with {C0}. It seems like you've already defined a macro called C0, though, so you'll need to give it another name.

{C0=...} defines a macro called C0, which you then use with {C0}. It seems like you've already defined a macro called C0, though, so you'll need to give it another name.

Thanks, niconii!