Database in READ WRITE Mode; desc dba_ gives error ;ORA-04043

Error Description:
The database was working perfectly and there was no major changes done in the database. Database is in Open mode (read write); But still the describe the data dictionary views like DBA_tables gives following error.
 
SQL> desc dba_tables
ERROR:
ORA-04043: object dba_tables does not exist
 
Solution Description
 
 

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