# Programming issue **URL:** \ **Category:** GNU Radio\ **Created:** [March 30, 2015, 2:19pm UTC](https://www.ruby-forum.com/t/programming-issue/241332 "2015-03-30T14:19:08Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![musicdenotation](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/ea666f/32.png) [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Post date:** [March 30, 2015, 2:19pm UTC](https://www.ruby-forum.com/t/programming-issue/241332/1 "2015-03-30T14:19:08Z")
Hi… I trying to build the costas loop for 16QPSK. But there are some errors are there. I’m not getting the error message. the message is like: 2: Test command: /bin/sh “/home/lekha/gr-project/build/python/qa\_cost\_test.sh” 2: Test timeout computed to be: 9.99988e+06 2: Traceback (most recent call last): 2: File “/home/lekha/gr-project/python/qa\_cost.py”, line 26, in 2: import project\_swig as proj 2: File “/home/lekha/gr-project/build/swig/project\_swig.py”, line 26, in 2: \_project\_swig = swig\_import\_helper() 2: File “/home/lekha/gr-project/build/swig/project\_swig.py”, line 22, in swig\_import\_helper 2: \_mod = imp.load\_module(’\_project\_swig’, fp, pathname, description) 2: ImportError: /home/lekha/gr-project/build/lib/libgnuradio-project.so: undefined symbol: \_ZN2gr6blocks12control\_loop18set\_loop\_bandwidthEf 1/1 Test #2: qa\_cost …\*\*\*Failed 0.46 sec 0% tests passed, 1 tests failed out of 1 Total Test time (real) = 0.46 sec The following tests FAILED: 2 - qa\_cost (Failed) Errors while running CTest what is the solution? please help me ---
**Author:** ![Vishwanatha\_H\_G](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/f19dbf/32.png) [@Vishwanatha\_H\_G](https://www.ruby-forum.com/u/Vishwanatha_H_G)\ **Post date:** [March 30, 2015, 5:16pm UTC](https://www.ruby-forum.com/t/programming-issue/241332/2 "2015-03-30T17:16:11Z")
Hi Vishwanatha, Looks like you have a function called set\_loop\_bandwidth that hasn’t been declared in your header files. -Doug Douglas Anderson | Intern DOC/NTIA/ITS-T | 325 Broadway St., Boulder, CO 80305 | P: 303 497 3582 * * * From: discuss-gnuradio-bounces+danderson=removed\_email\_address@domain.invalid [discuss-gnuradio-bounces+danderson=removed\_email\_address@domain.invalid] on behalf of Vishwanatha H G [removed\_email\_address@domain.invalid] Sent: Monday, March 30, 2015 6:17 AM To: removed\_email\_address@domain.invalid Subject: [Discuss-gnuradio] programming issue Hi… I trying to build the costas loop for 16QPSK. But there are some errors are there. I’m not getting the error message. the message is like: 2: Test command: /bin/sh “/home/lekha/gr-project/build/python/qa\_cost\_test.sh” 2: Test timeout computed to be: 9.99988e+06 2: Traceback (most recent call last): 2: File “/home/lekha/gr-project/python/qa\_cost.py”, line 26, in 2: import project\_swig as proj 2: File “/home/lekha/gr-project/build/swig/project\_swig.py”, line 26, in 2: \_project\_swig = swig\_import\_helper() 2: File “/home/lekha/gr-project/build/swig/project\_swig.py”, line 22, in swig\_import\_helper 2: \_mod = imp.load\_module(’\_project\_swig’, fp, pathname, description) 2: ImportError: /home/lekha/gr-project/build/lib/libgnuradio-project.so: undefined symbol: \_ZN2gr6blocks12control\_loop18set\_loop\_bandwidthEf 1/1 Test #2: qa\_cost …\*\*\*Failed 0.46 sec 0% tests passed, 1 tests failed out of 1 Total Test time (real) = 0.46 sec The following tests FAILED: 2 - qa\_cost (Failed) Errors while running CTest what is the solution? please help me