"sub" is not a function when calling setState function

[alexander-chi]

Uncaught TypeError: sub is not a function
at jstates.js:34
at Array.map ()
at Object.setState (jstates.js:33)
at onPageLoad (index.js:9)
at index.js:3

my code looks like this :

if (readFromLocal("defaultConfig") === null) {
console.log("Setting runningConfig to globalDefaultConfig");
runningConfig.setState(globalDefaultConfig);
}

As far as I can tell the state is set successfully as I am able to then access the state using the getState method.

[alexander-chi]

Whoops! my fault!

when subscribing I had included the brackets like so :
runningConfig.subscribe(runningConfigOnUpdate());

the proper form should have been

runningConfig.subscribe(runningConfigOnUpdate);