ADALM PLUTO generated python file.

hello, I've bought a ADALM PLUTO device recently. I tried to run the fm transmitter example given in the gr-iio library. however when I generate the python file I get the following error:

TypeError: pluto_sink_make() takes at most 9 arguments (10 given)

The pluto_sink_make() looks as follows:

self.pluto_sink_0 = iio.pluto_sink('usb:0456:b673', 700000000, 2084000, 10 - 1, 20000000, 8000, False, 10.0, '', True)

guess the highlighted part is the extra argument. please help