template app crashes on changed file save

[suiluj]

hi i tried out the template but when I changed the background color the app crashes:

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[lib] [Running 'cargo build -p lib']
[lib]    Compiling nannou_dynamic v0.1.0 (/Users/.../nannou-projects/projects/a-first-hot-reload-test/nannou_dynamic)
[lib]    Compiling lib v0.1.0 (/Users/.../nannou-projects/projects/a-first-hot-reload-test/lib)
[lib]     Finished `dev` profile [optimized + debuginfo] target(s) in 0.61s
[lib] [Finished running. Exit status: 0]
[bin] thread '<unnamed>' panicked at src/main.rs:3:1:
[bin] hot lib update(): LibraryLoadError(DlOpen { desc: "dlopen(/Users/.../nannou-projects/projects/a-first-hot-reload-test/target/debug/liblib-hot-1.dylib, 0x0005): Symbol not found: __ZN62_$LT$nannou..frame..Frame$u20$as$u20$core..ops..drop..Drop$GT$4drop123456789E\n  Referenced from: <E1234567D> /Users/.../nannou-projects/projects/a-first-hot-reload-test/target/debug/liblib-hot-1.dylib\n  Expected in:     <DF1D2889-6B44-31A6-B1EF-36240AFD2B10> /Users/.../nannou-projects/projects/a-first-hot-reload-test/target/debug/deps/libnannou_dynamic.dylib" })
[bin] note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
[bin] thread 'main' panicked at src/main.rs:3:1:
[bin] lib loader RwLock read failed: PoisonError { .. }
[bin] [Finished running. Exit status: 101]

i used the cargo runcc command and installed runcc and cargo-watch before.