android - statfs /storage/sdcard0 failed, errno: 13 -

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receiving error in logcat illegal argument exception

statfs /storage/sdcard0 failed, errno: 13

my code 

public double totalstorage() throws exception {           **stat = new statfs(environment.getexternalstoragedirectory().getpath());**         return ((double) stat.getblocksize()                 * (double) stat.getblockcount());     }

please help

errno 13 indicates "permission denied", meaning have insufficient privileges.


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