# New OOT block shows up in list but erases flowgraph when i use it

**URL:** <https://www.ruby-forum.com/t/new-oot-block-shows-up-in-list-but-erases-flowgraph-when-i-use-it/243069>\
**Category:** GNU Radio\
**Created:** [August 19, 2015, 4:50pm UTC](https://www.ruby-forum.com/t/new-oot-block-shows-up-in-list-but-erases-flowgraph-when-i-use-it/243069 "2015-08-19T16:50:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Sadaf\_N](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/858c86/32.png) [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\
**Post date:** [August 19, 2015, 4:50pm UTC](https://www.ruby-forum.com/t/new-oot-block-shows-up-in-list-but-erases-flowgraph-when-i-use-it/243069/1 "2015-08-19T16:50:34Z")

</div>

I wrote an out of tree block based on the tutorial and after i compile  
it,  
the block shows up in the list in GRC, but when i drag it into the  
flowgraph it erases the whole thing options block and all.

as a workaround, i’ve also tried editing a working OOT block that i have  
on  
my machine, but when i recompile the block to have some new parameters  
(more variable fields in the gui) the options don’t show up in GRC.

any help would be greatly appreciated.

-b

---

<div class="post-metadata">

**Author:** ![ben\_Gee](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/b/85f322/32.png) [@ben\_Gee](https://www.ruby-forum.com/u/ben_Gee)\
**Post date:** [August 19, 2015, 7:05pm UTC](https://www.ruby-forum.com/t/new-oot-block-shows-up-in-list-but-erases-flowgraph-when-i-use-it/243069/2 "2015-08-19T19:05:31Z")

</div>

On Wed, Aug 19, 2015 at 10:49 AM, ben Gee [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> -b

That behavior generally occurs when the GRC .xml file of your block is  
incorrect in some way.

Tom