I'm trying to get SQL Server to do event tracing. when I execute this line in Query Analyzer (I already executed sp_trace_create and got back 0 as the trace ID)

exec sp_trace_setevent 0, 14, 4, 1

I get back

Procedure expects parameter '@on' of type 'bit'.

The help files say that on is the 4th parameter, and that bit constants are to be expressed as 1 or 0 with no quotes. What gives?