[Discuss-gnuradio] Help needed

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I have been using gnurad-companion for some time now but for the last few months I have been getting errors that prevent use.  My system is an up to date Mint OS.  The version of the application is 3.7.6.1.

I am experiencing errors that according to internet searches appear every now and then for several years.  What is inhibiting me is when the top_block is executed, it dies with "no attribute"GetWIn".

Unfortunately, all remedies I have tried have not helped.  Any suggestions, pointers or other help would be appreciated.

73,

Alan - W6ARH