crash and can't connect to server

[bitcard]

1, crash because of no tweetnacl lib.
/**
* Loads the TweetNaCl JNI library.
*
*/
static {
System.loadLibrary("tweetnacl");
}

the code no use.
try {
KeyPair keyPair = TweetNaCl.cryptoBoxKeyPair();
byte[] val =keyPair.publicKey;
LogD(bytesToHex(val));
} catch (KeyPairException e) {
e.printStackTrace();
}
the public key no send to server. and private key no save to local.

2, can't connect to server.
I setup the nodejs server, but con't connected and register a new user.