reset sequence

Hi List,

I need that somebody help me.
First, I use PostgreSQL 7.0.3 for linux.
I need reset my sequence but that it begin in 1 again when a use nextval.
And I have been search in http://archives.postgresql.org/ about reset 
sequence but I obtain this information:  SELECT setval('name_sequence', 1, false);

Now when I execute this command I have a message ERROR.
"ERROR: Function 'setval(unknow, int4, bool)' does not exist. Unable to 
identify a function that satisfies the given argument types. You may need to 
add explicit typecast".


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