FATAL: file_map_allocate: Exceeded filemap limit

I receive this error :
FATAL: file_map_allocate: Exceeded filemap limit
Squid Cache (Version 2.2.STABLE4): Terminated abnormally.
CPU Usage: 0.340 seconds
Maximum Resident Size: 0 KB
Page faults with physical i/o: 287
Memory usage for squid via mallinfo():
        total space in arena: 2539 KB
        Ordinary blocks: 2515 KB 49 blks
        Small blocks: 0 KB 0 blks
        Holding blocks: 176 KB 1 blks
        Free Small blocks: 0 KB
        Free Ordinary blocks: 23 KB
        Total in use: 2691 KB 106%
        Total free: 23 KB 1%

What's wrong ?
Received on Fri Aug 20 1999 - 05:18:24 MDT