I think the following is self explanatory:

julia> Pkg.update()
INFO: Updating METADATA...
INFO: Updating cache of WoodburyMatrices...
INFO: Updating RobustStats...
INFO: Computing changes...
ERROR: Rmath can't be installed because it has no versions that support 
0.3.7 of julia. You may need to update METADATA by running `Pkg.update()`
 in error at error.jl:22
 in resolve at 
/Applications/Julia-0.3.7.app/Contents/Resources/julia/lib/julia/sys.dylib
 in update at 
/Applications/Julia-0.3.7.app/Contents/Resources/julia/lib/julia/sys.dylib
 in anonymous at pkg/dir.jl:28
 in cd at 
/Applications/Julia-0.3.7.app/Contents/Resources/julia/lib/julia/sys.dylib
 in __cd#228__ at 
/Applications/Julia-0.3.7.app/Contents/Resources/julia/lib/julia/sys.dylib
 in update at 
/Applications/Julia-0.3.7.app/Contents/Resources/julia/lib/julia/sys.dylib

Anyone can explain to me possible reasons causing this to happen?

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