WARNING: Module Compat uuid did not match cache file

[zoulingnan]

Received the error message "WARNING: Module Compat uuid did not match cache file
" when attempting to load the Optim.jl package. See full error message below. Running Julia v4.5 and IJulia notebook.

using Optim

INFO: Recompiling stale cache file /Users/zoulingnan/.julia/lib/v0.4/Calculus.ji for module Calculus.
WARNING: Module Compat uuid did not match cache file
This is likely because module Compat does not support precompilation but is imported by a module that does.
WARNING: deserialization checks failed while attempting to load cache from /Users/zoulingnan/.julia/lib/v0.4/Calculus.ji
INFO: Precompiling module Calculus...
INFO: Recompiling stale cache file /Users/zoulingnan/.julia/lib/v0.4/Calculus.ji for module Calculus.
WARNING: Module Compat uuid did not match cache file
This is likely because module Compat does not support precompilation but is imported by a module that does.
LoadError: precompile(true) but require failed to create a precompiled cache file
while loading In[30], in expression starting on line 1

in require at /Applications/Julia-0.4.5.app/Contents/Resources/julia/lib/julia/sys.dylib
in stale_cachefile at loading.jl:457
in recompile_stale at loading.jl:474
in _require_from_serialized at loading.jl:83
in _require_from_serialized at /Applications/Julia-0.4.5.app/Contents/Resources/julia/lib/julia/sys.dylib
in require at /Applications/Julia-0.4.5.app/Contents/Resources/julia/lib/julia/sys.dylib
in stale_cachefile at loading.jl:457
in recompile_stale at loading.jl:474
in _require_from_serialized at loading.jl:83
in _require_from_serialized at /Applications/Julia-0.4.5.app/Contents/Resources/julia/lib/julia/sys.dylib
in require at loading.jl:235
[inlined code] from /Users/zoulingnan/.julia/v0.4/Requires/src/require.jl:11
in require at /Users/zoulingnan/.julia/v0.4/Requires/src/hook.jl:17

[yuyichao]

Not a Compat issue. Should at least be gone if you try again.

[stevengj]

See JuliaLang/julia#12508