not a single-group group function error

From: Lance Prais <lprais_at_ts.checkpoint.com>
Date: Mon, 28 Jan 2002 16:06:04 -0800
Message-ID: <F001.003FDF25.20020128150526@fatcity.com>

Why when I use the following SQL it get a

ORA-00937: not a single-group group function
ORA-06512: at "PRIMUS.LICENSE_USE_EVERY_30", line 14
ORA-06512: at line 1

Thank you in advance
Lance

SELECT

      ROUND(AVG(COUNT(Time_stamp))),
          MIN(COUNT(time_stamp)),
          MAX(COUNT(time_stamp)),
          Time_stamp
    FROM
          cp_license_use
        Where time_stamp = parmTime
        and time_stamp >= SYSDATE-7
        group by Time_Stamp)

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Author: Lance Prais
  INET: lprais_at_ts.checkpoint.com

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