Getting 404 with sample code

I cloned sample code from here:

But it did not work. I got 404 error when calling to jrpc.
Please check this link jrpc below and help me.

POST ://sapphire-dev-2-5.authnetwork.dev/sss/jrpc/sss/jrpc 404
POST ://sapphire-dev-2-1.authnetwork.dev/sss/jrpc/sss/jrpc 404
POST ://sapphire-dev-2-3.authnetwork.dev/sss/jrpc/sss/jrpc 404
POST ://sapphire-dev-2-4.authnetwork.dev/sss/jrpc/sss/jrpc 404
POST ://sapphire-dev-2-2.authnetwork.dev/sss/jrpc/sss/jrpc 404

mpcCoreKit.ts:191 login error Error: Unable to resolve enough promises.
at some.ts:72:1
at

@thangnd Welcome Aboard!

Please upgrade to the latest SDK and update the libraries for react to the latest version.