_shared_pool_reserved_min_alloc must be between 4000 and 0 in oracle 10G

I am attempting to use automatic shared memory management in oracle 10G, but
having set the sga_target value and attempted to bounce the database I get
the error

ORA-00093: _shared_pool_reserved_min_alloc must be between 4000 and 0

 when I try to startup

If I try to set this value, it then says the parameter is obsolete!.

Anyone know how to get around this?



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