# Howto example error **URL:** \ **Category:** GNU Radio\ **Created:** [May 22, 2014, 11:27pm UTC](https://www.ruby-forum.com/t/howto-example-error/229945 "2014-05-22T23:27:39Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![jason\_sam](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/7993a0/32.png) [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Post date:** [May 22, 2014, 11:27pm UTC](https://www.ruby-forum.com/t/howto-example-error/229945/1 "2014-05-22T23:27:39Z")
Hi, I’m playing with the howto example as shown by the following link on a Macbook Pro machine. [http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules](http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules) I can go until $make. When I run $make test, an error pops up and shows $ make test Running tests… Test project /Users/pzhang/tmp/gr-howto/build Start 1: test\_howto 1/2 Test #1: test\_howto … Passed 0.02 sec Start 2: qa\_square\_ff 2/2 Test #2: qa\_square\_ff …\*\*\*Failed 0.55 sec 50% tests passed, 1 tests failed out of 2 Total Test time (real) = 0.59 sec The following tests FAILED: 2 - qa\_square\_ff (Failed) Errors while running CTest make: \*\*\* [test] Error 8 I tried $ctest -V, the error message shows $ ctest -V UpdateCTestConfiguration from :/Users/pzhang/tmp/gr-howto/build/DartConfiguration.tcl UpdateCTestConfiguration from :/Users/pzhang/tmp/gr-howto/build/DartConfiguration.tcl Test project /Users/pzhang/tmp/gr-howto/build Constructing a list of tests Done constructing a list of tests Checking test dependency graph… Checking test dependency graph end test 1 Start 1: test\_howto 1: Test command: /bin/sh “/Users/pzhang/tmp/gr-howto/build/lib/test\_howto\_test.sh” 1: Test timeout computed to be: 9.99988e+06 1: 1: 1/2 Test #1: test\_howto … Passed 0.02 sec test 2 Start 2: qa\_square\_ff 2: Test command: /bin/sh “/Users/pzhang/tmp/gr-howto/build/python/qa\_square\_ff\_test.sh” 2: Test timeout computed to be: 9.99988e+06 2: Fatal Python error: PyThreadState\_Get: no current thread 2: /Users/pzhang/tmp/gr-howto/build/python/qa\_square\_ff\_test.sh: line 7: 36036 Abort trap: 6 /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2 /Users/pzhang/tmp/gr-howto/python/qa\_square\_ff.py 2/2 Test #2: qa\_square\_ff …\*\*\*Failed 0.52 sec 50% tests passed, 1 tests failed out of 2 Total Test time (real) = 0.56 sec The following tests FAILED: 2 - qa\_square\_ff (Failed) Errors while running CTest It seems that the following command does not execute correctly. /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2 /Users/pzhang/tmp/gr-howto/python/qa\_square\_ff.py Therefore I enter this command in the terminal and an error shows $/opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2 /Users/pzhang/tmp/gr-howto/python/qa\_square\_ff.py Traceback (most recent call last): File “/Users/pzhang/tmp/gr-howto/python/qa\_square\_ff.py”, line 24, in import howto\_swig as howto ImportError: No module named howto\_swig I suppose howto\_swig should be added to the python path by gr\_modtool. Any idea how could I get over this problem? Thanks. Pengyu ---
**Author:** ![Pengyu\_Z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/e79b87/32.png) [@Pengyu\_Z](https://www.ruby-forum.com/u/Pengyu_Z)\ **Post date:** [May 23, 2014, 12:08am UTC](https://www.ruby-forum.com/t/howto-example-error/229945/2 "2014-05-23T00:08:52Z")
On Thu, May 22, 2014 at 2:25 PM, Pengyu Z. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Any idea how could I get over this problem? Looking through my howto files, I have that import line commented out but then again I was playing around with python only things. ---
**Author:** ![Pengyu\_Z](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/e79b87/32.png) [@Pengyu\_Z](https://www.ruby-forum.com/u/Pengyu_Z)\ **Post date:** [May 23, 2014, 3:27am UTC](https://www.ruby-forum.com/t/howto-example-error/229945/3 "2014-05-23T03:27:20Z")
Hi Pengyu - The way testing works right now under OSX (assuming you’re using OSX and MacPorts, yes?), you have to specify -all- of the dependency paths correctly before calling GR\_ADD\_TEST. The “test\_howto” is probably a C++ compiled executable, which CMake will know how to link correctly because of dependencies already specified; it does not currently call GR\_ADD\_TEST. But “qa\_square\_ff” is probably a Python script, which means that the PYTHONPATH and DYLD\_LIBRARY\_PATH must be set in a shell script in order to find the correct files (python script and the just built swig-ified library). Inside your “gr-howto/build” directory, if you do {{{ find . -name “\*.sh” }}} it should list at least 1 script. If you look through those found, you’ll figure out which one is called for “qa\_square\_ff” (“gr-howto/build/python/qa\_square\_ff\_test.sh”). You’ll see PYTHONPATH and DYLD\_LIBRARY\_PATH being set to something, but probably not quite what you want. What you do to correct this is, just before the call to GR\_ADD\_TEST in gr-howto/python/CMakeLists.txt, you set “GR\_TEST\_LIBRARY\_DIRS” to the top-level’s “lib” build directory, and GR\_TEST\_PYTHON\_DIRS to the top-level’s “python/howto” directory. When you re-run cmake, find the shell script and the correct PYTHONPATH and DYLD\_LIBRARY\_PATH should now be set. With these paths correct, “make test” should now function. I hope this helps. Feel free to ping me off-list and I’ll work you through this in greater detail. - MLD ps\> I’m currently working on fixing this issue to work with much greater robustness than the current model … but it’s just a “work in progress” branch right now & won’t be integrated until probably mid-summer.