error: undefined local variable or method `project_path' for #<Fui::Project:0x00007f9731a5c8d0>

Hello,

I am running fui with 
```fui -v --path=src --ignore-path=src/Pods find```
but end up with an error
```error: undefined local variable or method `project_path' for #<Fui::Project:0x00007f9731a5c8d0>```

What is the reason for such error and is there a workaround known?

Cheers, Andy