RaiseMan doesn't work in XCode 9

I’m trying to get the RaiseMan app to work in XCode 9 ( SWIFT v 4.0) but cannot figure out what I’m doing wrong. I have followed through the example but keep getting the following exception:

2017-09-28 15:26:25.670495+0100 RaiseMan[22487:1645287] [<RaiseMan.Document 0x6080000c70e0> valueForUndefinedKey:]: this class is not key value coding-compliant for the key employees.
2017-09-28 15:26:25.679530+0100 RaiseMan[22487:1645287] [<RaiseMan.Document 0x6000000c6e40> valueForUndefinedKey:]: this class is not key value coding-compliant for the key employees.

Any help really appreciated.

Additional:
I’ve now tried the following in a playground in XCode 9:

import Cocoa
class Employee: NSObject{
var employee: String = "New Employee"
var raise: Double = 0.05
}
let e = Employee()
e.employee
e.raise
e.setValue(“Steven”, forKey: “employee”)

The final line produces an error:

error: Execution was interrupted, reason: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0).
The process has been left at the point where it was interrupted, use “thread return -x” to return to the state before expression evaluation.

Is there a bug in XCode 9 thats making KVC not work correctly ?

solved it !

In case it’s of use to anyone I needed to add “@obj” in front of the properties I want to use in KVC to get it to work