Max session exceeded

  In the init.ora file, we have the setting
processes =2100
sessions = 2000

SQL> select count(*) from v$session;

  COUNT(*)
----------
      1948

SQL> select * from v$resource_limit;

RESOURCE_NAME                  CURRENT_UTILIZATION MAX_UTILIZATION INITIAL_AL
------------------------------ ------------------- --------------- ----------
LIMIT_VALU
----------
processes                                     1092            1239       2100
      2100

sessions                                      1948            2315       2315
      2315

 

Today, alll of the sudden we are getting

ora 604: Error occurred at recursive SQL 1 Level.
ora 00018: Maximum number of sessions exceeded.

There is no error in the alert log and I can even log in as system.

I have searched on the site that to resolve this I should increase the processes and sessions parameter in the pfile and bounce the database.