It does not work

The limite does not work. When it approaches to the origin like
Lim (x^2 +y^2) /(x^2 - y^2)
(X,y) -->(0,0)
It says that the value is 1
But actually it does not exist!!

Matheuscapano about Wolfram Multivariable Calculus Course Assistant, v1.1.0