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今天我决定学习 Rust，但是我试图编译一个简单的“hello world”程序但是我得到了这个错误:
fn main() {
println!("Hi");
}
error: linking with `cc` failed: exit code: 1
| = note: "cc" "-m64" "-L" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "test.test.7rcbfp3g-cgu.0.rcgu.o" "test.test.7rcbfp3g-cgu.1.rcgu.o" "test.test.7rcbfp3g-cgu.2.rcgu.o" "test.test.7rcbfp3g-cgu.3.rcgu.o" "test.test.7rcbfp3g-cgu.4.rcgu.o" "test.test.7rcbfp3g-cgu.5.rcgu.o" "-o" "test" "test.5fi6c8ty3hqyycqf.rcgu.o" "-Wl,-dead_strip" "-nodefaultlibs" "-L" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libstd-a5984f6fc2a4870f.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libpanic_unwind-7c9487d161f01b59.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc_jemalloc-e146b9b98ab73364.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libunwind-acb39784a181deae.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc_system-89f97a4bae8c89d2.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liblibc-cd336d4bb1fade3c.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/liballoc-d6545438808205eb.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcore-8aa8397108285683.rlib" "/Users/moo7md/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/x86_64-apple-darwin/lib/libcompiler_builtins-83c21e81fef8188c.rlib" "-lSystem" "-lresolv" "-lpthread" "-lc" "-lm"
| = note: xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun
谁能告诉我哪里出了问题？