Invoking non template function from template function

I am trying to call a member function from a member template function but it complains about not having overloads for member function. How do i fix it? Below is the test code.

class Test
{
public:
    template <typename T>
    void foo(int i, T param)
    {
        switch (i)
        {
        case 1:
            fun(param);
            break;
        case 2:
            bar(param);
        }
    }
    void fun(string p)
    {
        std::cout << "string: " << p << std::endl;
    }
    void bar(double p)
    {
        std::cout << "double: " << p << std::endl;
    }
};

int main() {
    Test t;
    t.foo(1, "hello");
    t.foo(2, 100.0);
    return 0;
}

error: no matching function for call to 'Test::fun(double&)'