The issue has solved as below:
The accessor method "poll_complex_gain" defined in its
*randphpert4_f_impl.h* file as below:
gr_complex poll_complex_gain() const { return d_complex_gain; }
The accessor method is added in the include/*.h file (*randphpert4_f.h*) as
a virtual member function
virtual gr_complex poll_complex_gain() const=0;
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