# Re: usrp\_probe fails with AttributeError: 'Param' object has no attribute 'get\_input'

**URL:** <https://www.ruby-forum.com/t/re-usrp-probe-fails-with-attributeerror-param-object-has-no-attribute-get-input/191338>\
**Category:** GNU Radio\
**Created:** [July 9, 2010, 8:52pm UTC](https://www.ruby-forum.com/t/re-usrp-probe-fails-with-attributeerror-param-object-has-no-attribute-get-input/191338 "2010-07-09T20:52:08Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jacinda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/46a35a/32.png) [@jacinda](https://www.ruby-forum.com/u/jacinda)\
**Post date:** [July 9, 2010, 8:52pm UTC](https://www.ruby-forum.com/t/re-usrp-probe-fails-with-attributeerror-param-object-has-no-attribute-get-input/191338/1 "2010-07-09T20:52:08Z")

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> can you post the warnings? and what version of gnuradio?

Sorry - I meant to include that. I’m using Version 3.3.1  
(v3.3.1git-30-g278b6db3).

There are many multiples of these; this is a sample of the last five. I  
get the exact same warning with grc, but that runs fine.

Warning: Block with key “wxgui\_histosink2” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/wxgui\_histosink2.xml  
Warning: Block with key “wxgui\_numbersink2” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/wxgui\_numbersink2.xml  
Warning: Block with key “wxgui\_scopesink2” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/wxgui\_scopesink2.xml  
Warning: Block with key “wxgui\_waterfallsink2” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/wxgui\_waterfallsink2.xml  
Warning: Block with key “xmlrpc\_client” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/xmlrpc\_client.xml  
Warning: Block with key “xmlrpc\_server” already exists.  
Ignoring: /usr/share/gnuradio/grc/blocks/xmlrpc\_server.xml

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<div class="post-metadata">

**Author:** ![jacinda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/46a35a/32.png) [@jacinda](https://www.ruby-forum.com/u/jacinda)\
**Post date:** [July 9, 2010, 11:43pm UTC](https://www.ruby-forum.com/t/re-usrp-probe-fails-with-attributeerror-param-object-has-no-attribute-get-input/191338/2 "2010-07-09T23:43:39Z")

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It looks like you have a case of multiple gnuradio installs. Not sure  
what else would cause this. And that would also explain the issue you  
have, possibly a version mismatch between the installed script and the  
library code.

I would clean all traces of gnuradio from /usr and /usr/local, uninstall  
any deb packages for gnuradio you might have installed. Then install  
exactly the version you want.

-Josh

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<div class="post-metadata">

**Author:** ![jacinda](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/46a35a/32.png) [@jacinda](https://www.ruby-forum.com/u/jacinda)\
**Post date:** [August 23, 2010, 1:57pm UTC](https://www.ruby-forum.com/t/re-usrp-probe-fails-with-attributeerror-param-object-has-no-attribute-get-input/191338/3 "2010-08-23T13:57:19Z")

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Hi Josh,

On calling 'usrp2\_probe’I am getting the exact same error as Jacinda. I  
am  
working with the USRP2 kit for the first time . On calling usrp2\_fft.py  
a GUI is  
opened but nothing is displayed in it . Also , in the terminal window an  
error  
message is displayed saying  
usrp2: channel 0 not recieving  
usrp2:: rx\_samples() failed  
I have installed only 1 version of gnuradio (gnuradio3.3.0) from their  
FTP .  
Kindly help.

Himanshu