c++ - calling template class constructor

I'm getting hard time figuring out solution for calling constructor of class which uses templates.

--Header file

template 
class Binary_tree
{
    string file_name;

    list arr_data;
public:

    Binary_tree(string fname);
    void printArr();
};

--cpp file

template 

Binary_tree::Binary_tree(string fname)
{

    File_Name = fname;
    total = 0;
    root = nullptr;

    std::ifstream filestream(fname);
    string line;

    while (!filestream.eof())
    {
        filestream >> line;

        arr_data.push_back(line);
    }
}

template 

void Binary_tree::printArr()
{
    int size = arr_data.size();

    for (int i = 0; i < size; i++)

    {
        cout << "arr_data [" << i << "] is: " << arr_data[i] << endl;
    }
} 

--main.cpp

int main(int argc, char** argv)
{

 Binary_tree test(file); 
 test.printArr();

 return 0;
}

Right now I'm getting LNK1120 and LNK2019 errors.