[Discuss-gnuradio] make check errors in release 3.5.0

[azalea au]

Hi all,
I'm having "make check" errors when installing gnuradio 3.5.0:

make[7]: Entering directory `/home/azalea/Desktop/gnuradio-3.5.0/gr-trellis/src/python'
Traceback (most recent call last):
  File "./qa_trellis.py", line 32, in <module>
    import digital_swig
ImportError: No module named digital_swig
FAIL: run_tests
==================
1 of 1 test failed
==================

Could you please give me any suggestions on how to fix it?

Many thanks,
Jia