blocks.message_sink(gr.sizeof_float, msgq, 1)
that's the line getting the error.  I think they've tightened up things a bit - this rings a vague bell.   You might try changing the third arg from 1 to True - this might not be the only such place that needs changing.  It's also possible that fixing this error will just get slightly further with another error - let's hope not but if so the next error might or might not be as easy to fix...

Max

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