# Error when running GRC flowchart in No GUI mode

**URL:** <https://www.ruby-forum.com/t/error-when-running-grc-flowchart-in-no-gui-mode/243064>\
**Category:** GNU Radio\
**Created:** [August 19, 2015, 12:17pm UTC](https://www.ruby-forum.com/t/error-when-running-grc-flowchart-in-no-gui-mode/243064 "2015-08-19T12:17:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Rafa\_F](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/r/958977/32.png) [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\
**Post date:** [August 19, 2015, 12:17pm UTC](https://www.ruby-forum.com/t/error-when-running-grc-flowchart-in-no-gui-mode/243064/1 "2015-08-19T12:17:09Z")

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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!

---

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**Author:** ![Miguel\_Cordero\_Lim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/77aa72/32.png) [@Miguel\_Cordero\_Lim](https://www.ruby-forum.com/u/Miguel_Cordero_Lim)\
**Post date:** [August 19, 2015, 12:28pm UTC](https://www.ruby-forum.com/t/error-when-running-grc-flowchart-in-no-gui-mode/243064/2 "2015-08-19T12:28:51Z")

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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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<div class="post-metadata">

**Author:** ![Miguel\_Cordero\_Lim](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/77aa72/32.png) [@Miguel\_Cordero\_Lim](https://www.ruby-forum.com/u/Miguel_Cordero_Lim)\
**Post date:** [August 19, 2015, 12:39pm UTC](https://www.ruby-forum.com/t/error-when-running-grc-flowchart-in-no-gui-mode/243064/3 "2015-08-19T12:39:22Z")

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