# GNU Radio wx fft sink error

**URL:** <https://www.ruby-forum.com/t/gnu-radio-wx-fft-sink-error/258918>\
**Category:** GNU Radio\
**Created:** [March 18, 2020, 5:25am UTC](https://www.ruby-forum.com/t/gnu-radio-wx-fft-sink-error/258918 "2020-03-18T05:25:54Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Pritha\_Bhattacharya](https://www.ruby-forum.com/user_avatar/www.ruby-forum.com/pritha_bhattacharya/32/2358_2.png) [@Pritha\_Bhattacharya](https://www.ruby-forum.com/u/Pritha_Bhattacharya)\
**Post date:** [March 18, 2020, 5:25am UTC](https://www.ruby-forum.com/t/gnu-radio-wx-fft-sink-error/258918/1 "2020-03-18T05:25:54Z")

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![WhatsApp Image 2020-03-17 at 8.34.37 PM](https://www.ruby-forum.com/uploads/default/original/2X/8/8c50bff823d796ea5563ebe92b8be57fac64c145.jpeg) I have just started using GNU Radio Companion and was trying to follow Michael Ossmann’s lectures but got stuck at a very early stage. I have just connected an Osmocom source block to a WX GUI fft sink and somehow, the fft chart isnt opening. This is very basic stuff, I know, but I would be really very glad if someone could help me get started by explaining this to me. I have attached the error screenshot for reference.