HTML PHP google single sign on signout will throw “Cannot read property 'getAuthInstance' of undefined”

Question

I have created google single sign on by following steps mentioned in https://developers.google.com/identity/sign-in/web/sign-in

The sign in works like a charm but when

Answer 1

I had same issue and seems that I found solution for me and I think this should be the case.

you should have method call like that, at the bottom of the script, like me, below:

gapi.load("client", initAuth);

this should be modified like

gapi.load("client:auth2", initAuth);

and this should work (at least worked for me).