Problem on calling the count_bits32() method

Hi,

 

I am writing a block that needs to call the gr::blocks::count_bits32() method in its corresponding CPP script. At the beginning of the script, I have added "#include <gnuradio/blocks/count_bits.h>".

 

When I used the "make" command to compile the program, no errors occurred.

 

However, when I typed the "ctest -V" command in the terminal to check the compilation, the following error appeared: "ImportError: /home/<my-path>/build/lib/libgnuradio-<my-module's-name>.so: undefined symbol: _ZN2gr6blocks12count_bits32Ej"

 

Then, I typed the "c++filt _ZN2gr6blocks12count_bits32Ej" command in the terminal and obtained an output: "gr::blocks::count_bits32(unsigned int)".

 

Do you have any idea why I encounter this error?

 

Best wishes,

Shumin Yao.

 

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