"Illegal structure operation" error meaning

This program produces the error "Illegal structure operation".
Code
  1. #include<iostream.h>

    2. 

  2. #include<conio.h>

    3. 

  3.  

    4. 

  4. const int i=10;

    5. 

  5.  

    6. 

  6. void main()

    7. 

  7. {

    8. 

  8.   const int i=20;

    9. 

  9.   clrscr();

    10. 

  10.   cout<<i<<endl<<::i;

    11. 

  11.   cout<<endl<<&i<<endl<<&::i;

    12. 

  12.   getch();

    13. 

  13. }

    14. 

  14.  
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Please explain the cause of this error.

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