error C2106: ‘=’ : left operand must be l-value

This error is being thrown for the same reason you can’t do something like this:

36 = 3;

Your version of Vector::at should be returning a reference rather than a value.
Lvalues are called Lvalues because they can appear on the left of an assignment. Rvalues cannot appear on the left side, which is why we call them rvalues. You can’t assign 3 to 36 because 36 is not an lvalue, it is an rvalue, a temporary. It doesn’t have a memory address. For the same reason, you cannot assign NULL to payroll.at(i).

Your definition:

template <class V> V MyVector<V>::at(int n)

What it should be:

template<typename V> V& MyVector::at(std::size_t n)
template<typename V> const V& MyVector::at(std::size_t n) const

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