could not load library "libz"- Failed to precompile

I am running Julia on Mac OS 11.1, and running into an error when trying to precompile. I get the error message,

ERROR: LoadError: LoadError: error compiling top-level scope: could not load library "libz"
dlopen(libz.dylib, 1): image not found
Stacktrace:
[1] include at ./boot.jl:317 [inlined]
[2] include_relative(::Module, ::String) at ./loading.jl:1044
[3] include at ./sysimg.jl:29 [inlined]
[4] include(::String) at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/GZip/JNmGn/src/GZip.jl:2
[5] top-level scope at none:0
[6] include_relative(::Module, ::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[7] include(::Module, ::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[8] top-level scope at none:2
[9] eval at ./boot.jl:319 [inlined]
[10] eval(::Expr) at ./client.jl:393
[11] top-level scope at ./none:3
in expression starting at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/GZip/JNmGn/src/zlib_h.jl:13
in expression starting at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/GZip/JNmGn/src/GZip.jl:73
ERROR: LoadError: LoadError: LoadError: Failed to precompile GZip [92fee26a-97fe-5a0c-ad85-20a5f3185b63] to /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/compiled/v1.0/GZip/s2LKY.ji.
Stacktrace:
[1] error(::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[2] compilecache(::Base.PkgId, ::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[3] _require(::Base.PkgId) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[4] require(::Base.PkgId) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:? (repeats 2 times)
[5] include at ./boot.jl:317 [inlined]
[6] include_relative(::Module, ::String) at ./loading.jl:1044
[7] include at ./sysimg.jl:29 [inlined]
[8] include(::String) at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/MLDatasets/GU5Hj/src/MNIST/MNIST.jl:26
[9] top-level scope at none:0
[10] include at ./boot.jl:317 [inlined]
[11] include_relative(::Module, ::String) at ./loading.jl:1044
[12] include at ./sysimg.jl:29 [inlined]
[13] include(::String) at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/MLDatasets/GU5Hj/src/MLDatasets.jl:1
[14] top-level scope at none:0
[15] include_relative(::Module, ::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[16] include(::Module, ::String) at /Applications/JuliaPro-1.0.5-2.app/Contents/Resources/julia/Contents/Resources/julia/lib/julia/sys.dylib:?
[17] top-level scope at none:2
[18] eval at ./boot.jl:319 [inlined]
[19] eval(::Expr) at ./client.jl:393
[20] top-level scope at ./none:3
in expression starting at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/MLDatasets/GU5Hj/src/MNIST/Reader/Reader.jl:2
in expression starting at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/MLDatasets/GU5Hj/src/MNIST/MNIST.jl:70
in expression starting at /Users/hannah/.juliapro/JuliaPro_v1.0.5-2/packages/MLDatasets/GU5Hj/src/MLDatasets.jl:45

I already tried adding zlib-ng with home-brew, but it didn't work. Would appreciate any suggestions :)
Thanks!