Startup error

![7seas-error](https://user-images.githubusercontent.com/30298/63600457-75866480-c578-11e9-8bda-73a6ec8c9de2.png)

Happens on 411826f05af on OS X when attempting to let 7seas startup Pirate by itself. A better error message which describes which file/binary is attempting to be run would be useful