[WinError 2] 系统找不到指定的文件。&&Can not find cl.exe

I built tvm with llvm on windows.
When I was running the examples,two errors came out.
I revised the target and ctx.
target=‘llvm’

ctx=tvm.cpu()

FileNotFoundError: [WinError 2] 系统找不到指定的文件。
RuntimeError: Can not find cl.exe,please run this in Vistual Studio Command Prompt.

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