# Gr::buffer::index\_add Assertion failure

**URL:** <https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395>\
**Category:** GNU Radio\
**Created:** [February 25, 2014, 12:51am UTC](https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395 "2014-02-25T00:51:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\
**Post date:** [February 25, 2014, 12:51am UTC](https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395/1 "2014-02-25T00:51:11Z")

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**Author:** ![Tommy\_TSII](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/t/e56c9b/32.png) [@Tommy\_TSII](https://www.ruby-forum.com/u/Tommy_TSII)\
**Post date:** [February 25, 2014, 4:23pm UTC](https://www.ruby-forum.com/t/gr-index-add-assertion-failure/239395/2 "2014-02-25T16:23:50Z")

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On Mon, Feb 24, 2014 at 6:49 PM, Tommy T. II [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
wrote:

> Sincerely,  
> Tommy James Tracy II  
> Ph.D Student  
> High Performance Low Power Lab  
> University of Virginia  
> Phone: 913-775-2241

You should absolutely not be seeing this error. That code is far below  
the API and hasn’t changed for quite a few years. I’m guessing you’re  
abusing the scheduler somehow. Check any blocks that you’ve created to  
make sure they are handling the input/output buffers and  
consume/produce issues properly.

Tom