[6502] Error: Invalid name

I have a bit of assembly I was able to decrypt as part of an online puzzle. I keep getting the same error when I try to run it.

Code:

Error: invalid name.

Description:

Instruction: F459:30 0C BMI RTS1

I've tried renaming the label to several different things in case its some kind of instruction conflict but that hasn't helped. Here's the relevant piece of code:

Code:

   
F44E: D0 F3               BNE  SWAP1    
F450: 60                  RTS           
F451: A9 8E     FLOAT     LDA  #$8E     
F453: 85 F8               STA  X1       
F455: A5 F9     NORM1     LDA  M1       
F457: C9 C0               CMP  #$C0     
F459: 30 0C               BMI  RTS1     
F45B: C6 F8               DEC  X1       
F45D: 06 FB               ASL  M1+2
F45F: 26 FA               ROL  M1+1     
F461: 26 F9               ROL  M1
F463: A5 F8     NORM      LDA  X1       
F465: D0 EE               BNE  NORM1    
F467: 60        RTS1      RTS           
F468: 20 A4 F4  FSUB      JSR  FCOMPL   
F46B: 20 7B F4  SWPALGN   JSR  ALGNSWP

What is going wrong here? Is it actually the BMI instruction? the following instruction? the instruction after the branch? I've never written x86 assembly so I'm a bit at a loss here, I'd love any help.