why I have the permission denied error when i try to save data

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:/t set ([] c1:1 2 3; c2:(1;1;“a”))

'/t. OS reports: Permission denied

  [0]  :/t set ([] c1:1 2 3; c2:(1;1;“a”))

:/t is in the root directory of your machine. try :t which is local to your current working directory.