# Issues with OOT

**URL:** <https://www.ruby-forum.com/t/issues-with-oot/242830>\
**Category:** GNU Radio\
**Created:** [July 31, 2015, 5:05pm UTC](https://www.ruby-forum.com/t/issues-with-oot/242830 "2015-07-31T17:05:44Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**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:** [July 31, 2015, 5:05pm UTC](https://www.ruby-forum.com/t/issues-with-oot/242830/1 "2015-07-31T17:05:44Z")

</div>

Hi everyone,

I am writing here because I have some issues using an OOT module.  
Actually,  
I have gnuradio installed on my desktop.

I want to install gnuradio on other laptop so that I can use 2 USRP.

So, I followed the steps described here  
“_[http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGRFromSource](http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGRFromSource)  
 [http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGRFromSource](http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGRFromSource)_”,  
where I used the _build-gnuradio_ script. (I have already used this  
script  
to install gnuradio on my desktop).

- I created a new folder, named “gnuradio” in /opt.
- I then run \*cd /opt/gnuradio _and_ wget  
[http://www.sbrac.org/files/build-gnuradio](http://www.sbrac.org/files/build-gnuradio)  
[http://www.sbrac.org/files/build-gnuradio](http://www.sbrac.org/files/build-gnuradio) && chmod a+x  
./build-gnuradio  
&& ./build-gnuradio \*. After a while, all the process is done.
- I followed all steps presented in  
_[http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig](http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig)  
 [http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig](http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig)_,  
to create a new OOT module.

But, In GRC, when I want to use my new OOT module, I get this error :

_– Traceback (most recent call last): File  
“/home/sagem/Bureau/top\_block.py”, line 140, in tb =  
top\_block() File “/home/sagem/Bureau/top\_block.py”, line 65, in  
 **init** self.test\_block\_test\_0 = test.block\_test()AttributeError:  
‘module’ object has no attribute ‘block\_test’_  
My block, named block\_test, do nothing. It just copy all inputs items  
into  
output buffer.

I read some discusses about this error, but I can’t understand why I get  
it.  
I checked all my _CMakelist.txt_, and all is good.  
I run _make test_, and all test passed.

If someone could help me to figure this out, It would be very helpfull.

Marius

_CACHELIN Marius_  
_Ingénieur Systèmes, Réseaux et Télécommunications_  
removed\_email\_address@domain.invalid

---

<div class="post-metadata">

**Author:** ![mariusc](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ee7513/32.png) [@mariusc](https://www.ruby-forum.com/u/mariusc)\
**Post date:** [July 31, 2015, 6:49pm UTC](https://www.ruby-forum.com/t/issues-with-oot/242830/2 "2015-07-31T18:49:44Z")

</div>

Marius,

hard to say from this info. However, did you go through  
[http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided\_Tutorials](http://gnuradio.org/redmine/projects/gnuradio/wiki/Guided_Tutorials) to  
learn how to write blocks? Those tutorials usually explain the most  
common pitfalls.

Cheers,  
M