Standard squelch crashing?

im trying to implement standard squelch into one of my flowgraps however
crashes when excuted.
a test flowgraph null source -> squelch -> null sink heres what i get
in
top_block.py

##################################################

Blocks

##################################################
self.blks2_standard_squelch_0 = -------->
cannot find ‘set_threshold’ while searching for ‘set_threshold’:
blks2.standard_squelch(audio_rate=$audio_rate)
$id.set_threshold($threshold)
<--------
self.gr_null_sink_0 = gr.null_sink(gr.sizeof_float1)
self.gr_null_source_0 = gr.null_source(gr.sizeof_float
1)

Any ideas?
dave

fixed in gnuradio trunk r11033

_josh

Works! thanks