ORA-08102 while creating a view

I am learning PL/SQL programming. I'm trying to create a view with the following statement:

create or replace view viewName as select ID from employees; 

The view creation throws the following error:

ORA-00604 error occurred at recursive level 1
ORA-08102 Index not found, obj #39 , file 1 block 61248

How can I fix it?

The problem is with all objects, procedures,functions,views and i am using the HR Database of Oracle 11G for learning purposes.