fcdp-tetra_demod.py error with Gnuradio 3.7.2

Hello I have the following error running fcdp-tetra_demod.py ./170913/src/demod/python/fcdp-tetra_demod.py -D hw:1 -o /dev/stdout | ./170913/src/float_to_bits /dev/stdin /dev/stdout | ./170913/src/tetra-rx /dev/stdin Traceback (most recent call last): File "./170913/src/demod/python/fcdp-tetra_demod.py", line 5, in <module> from gnuradio import gr, gru, audio, eng_notation, blks2, optfir ImportError: cannot import name blks2 Gnuradio is 3.7.2 Liboscomore has been download from git clone git://git.osmocom.org/libosmocore.git no error in Gnuradio liboscomore , Tetra-rx installation Saw that Gnuradio has different blocks structures and a programm to migrate from 3.6.51 to 3.7 Thanks for answer