Error when running GRC flowchart in No GUI mode

Hi all,

I’m having trouble when trying to run a GRC flowchart with the No GUI
option. The thing is that even with the simplest flowchart I get the
following error: can only concatenate list (not “str”) to list. I’ve
tried all the different configurations in the Options block but I get
always the same result.

I’m using GNU Radio Companion v3.7.7.1-154-g7ee2f91d in a machine
running Ubuntu Precise 64 bits (Linux kernel 3.13.0-55-generic).

Find attached the .grc file I am using and a screenshot of what I get
when I run it.

Can anybody give me some insight on this?

Thank you very much in advance!

It’s an issue in that particular version of GNU Radio. I see the same
thing here.

The good news is that the No GUI option works correctly in the latest
release (3.7.8).

Ron


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