mapping not found

It seems like you're encountering an issue with a "mapping not found." However, your message is a bit vague, and I would need more context to provide a more accurate response.

Could you please provide more details about where and how you're encountering this error? Are you working with a specific software, programming language, or system? The more information you provide, the better I can assist you in troubleshooting the problem.

无论是关于软件、编程语言还是其他系统，我都会尽力提供帮助。