Compilation Error

I got 
```
mpc/change_encryption_scheme.cc: In member function ‘Ctxt Change_ES_FHE_to_GM_A::unblind(const Ctxt&, const FHEPubKey&, const EncryptedArray&)’:
mpc/change_encryption_scheme.cc:45:15: error: ‘class PlaintextArray’ has no member named ‘encode’
         array.encode(1);
```
when I `make` under src/