1st of all, please make a thread with a title that explains what the question is, such as "decrypt9 arm9 error?". 2ndly, are you using b9s 1.2 or 1.0? If you use 1.0, update both b9s and decrypt9 to the latest version. If you use b9s 1.2, just update decrypt9 to the latest version. If you're unsure, just update decrypt9. If it works, you're on 1.2, if it doesn't, you're on 1.0.