Help with C++ linker error -

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I am struggling with a linker error which I can not understand, I am implementing the Bell Ford Algorithm I'm part of my homework.

Even I have a code written so far, it would be good if someone can explain to me why I am getting this error, I have stuck my code on Mozilla Pastebin, two files Graph is H: and Belman_fird.cpp:

All the solutions will be appreciated and thank you for taking the time to help me out for your valuable time.

you vertex :: vertex () or edge :: Edge () - They have just been announced.

Apply them as: 

  class Vertex {private: char vertex_name; Public: Vertex () {} ... Class Edge {Private: Vertex Source, Destination; Visceral weight; Public: Edge () {} ...   
 If you include  graph.h  with more than one CPP file, you will also get errors .    You should move the bodies of your member works into a  graph.cpp  file instead of moving them to the header.

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