[R] error in loading rgdal package

[lily li]

Hi R users,

Could you help me to see this problem? I could now load "rgdal" even though
I downloaded the compressed folder. Thanks for your help.

Loading required package: sp
Error in dyn.load(file, DLLpath = DLLpath, ...) :
  unable to load shared object
'/Library/Frameworks/R.framework/Versions/3.3/Resources/library/rgdal/libs/rgdal.so':

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