Warning: emukod API not ready after 30s at 127.0.0.1:7788

I get this:
```
sander@x360:~/git/emuko$ emuko start
Started emukod (pid 37019)
Warning: emukod API not ready after 30s at 127.0.0.1:7788
emukod exited with exit status: 1
sander@x360:~/git/emuko$ 
```

Command history:

```
git clone https://github.com/wkoszek/emuko.git
cd emuko/
make
alias emuko=target/release/emuko
emuko dow
emuko start
```

Tips? PEBKAC?

