Can not verify signature schnorr MPC

In file: https://github.com/keyfuse/tokucore/blob/master/xcrypto/mpc_schnorr_test.go

If I add code: 
```
assert.Nil(t, SchnorrVerify(sharepub1, hash, fs1))
```
 at the end function `TestMpcSchnorr`, I got error: `schnorr.signature.verify.failed`

How can fix it?