ccxt: Bitmart signIn Invalid Request error.

Trying to signIn to use authenticated api routes, keep getting this error.

• OS: Ubuntu
• Programming Language version:Node 8.15
• CCXT version: 1.30.39

var bitmart = new ccxt.bitmart({
  apiKey: 'BITMART_KEY',
  secret: 'BITMART_SECRET',
  uid: 'BITMART_MEMO'
});
 bitmart.signIn().catch(err => {
    log.info(err)
 });

2020-06-24 15:24:32.879 INFO  bitmart {"message":"Invalid request"}