# Block key "rtl2832\_source" not found in Platform

**URL:** <https://www.ruby-forum.com/t/block-key-rtl2832-source-not-found-in-platform/220871>\
**Category:** GNU Radio\
**Created:** [June 22, 2012, 7:11pm UTC](https://www.ruby-forum.com/t/block-key-rtl2832-source-not-found-in-platform/220871 "2012-06-22T19:11:09Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [June 22, 2012, 7:11pm UTC](https://www.ruby-forum.com/t/block-key-rtl2832-source-not-found-in-platform/220871/1 "2012-06-22T19:11:09Z")

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Dear All,  
I am new of SDR. I’ve read a lot and compiled Gnuradio and gr-baz on my  
macbook snow leopard 10.6.8…but nothing, gnuradio doesn’t recognize  
my ezcap as source…It’s a week that I try different combinations but i  
really don’t understand what to change.  
Can you help me?  
Many Thanks  
Giulio

MacBook-di-Giulio:~ Giulio$ export  
PYTHONPATH=$PYTHONPATH:/opt/local/lib/python2.6/site-packages:/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/:/usr/local/lib/python2.7/site-packages/

MacBook-di-Giulio:~ Giulio$  
gnuradio-companion/opt/local/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/site-packages/numpy/random/ **init**.py:87:  
RuntimeWarning: compiletime version 2.6 of module ‘mtrand’ does not  
match runtime version 2.7  
from mtrand import \*  
\<\<\< Welcome to GNU Radio Companion 3.3.0 \>\>\>

Loading: “/Users/Giulio/rtl2832-fm.grc”

> > > Error: Block key “rtl2832\_source” not found in Platform - grc(GNU Radio  
> > > Companion)  
> > > Traceback (most recent call last):  
> > > File “/opt/local/bin/gnuradio-companion”, line 51, in   
> > > try:  
> > > gtk.window\_set\_default\_icon(gtk.IconTheme().load\_icon(‘gnuradio-grc’,  
> > > 256, 0))  
> > > GError: Icona gnuradio-grc non presente nel tema
> 
> > > Error: Connection between rtl2832\_source\_0(0) and  
> > > gr\_freq\_xlating\_fir\_filter\_xxx\_0(0) could not be made.  
> > > Traceback (most recent call last):  
> > > File  
> > > “/opt/local/lib/python2.6/site-packages/gnuradio/grc/base/FlowGraph.py”,  
> > > line 197, in import\_data  
> > > assert(source\_block\_id in block\_ids)  
> > > AssertionError
> 
> > > Done

Showing: “/Users/Giulio/rtl2832-fm.grc”

---

<div class="post-metadata">

**Author:** ![Giulio](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/g/45deac/32.png) [@Giulio](https://www.ruby-forum.com/u/Giulio)\
**Post date:** [June 23, 2012, 7:55pm UTC](https://www.ruby-forum.com/t/block-key-rtl2832-source-not-found-in-platform/220871/2 "2012-06-23T19:55:02Z")

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Hi Giulio - It looks like GNU Radio is trying to mix and match between  
Python 2.6 and 2.7. This, in general, is not advisable; try to coerce  
GNU Radio into using one or the other. Fix that first, then see if  
there’s still an issue. If so, maybe someone with knowledge of the  
“rtl2832\_source” can help. Good luck! - MLD