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When I add "var applicationDate = (clubEvent.startParticipationDate.toString(DateTimeFormat.forPattern("' 'dd-MM-yyyy' 'HH:mm:ss' '")))" to my app, whenever I go to that page in the app, the app crashes.

I have no idea why, and I am trying to make it into a variable so I can call it in multiple places.

Look in logcat... Probably a null pointer exception

Can I copy the error message here? I dont understand it

Caused by: kotlin.UninitializedPropertyAccessException: lateinit property clubEvent has not been initialized

clubEvent has not been set, this error is somewhere else

The weird thing is, I can use the clubEvent.startParticipationDate by itself but not if I want to make a variable out of it

probably because that whole line is optimized out if you don't make a variable

you need to make sure clubEvent is set to something non-null before running that line

How can I do that? Sorry I am new to Kotlin

It has nothing to do with kotlin.... You have to set that variable...

You have an uninitialized
`lateinit var clubEvent: ClubEvent`
in your code. Before accessing that variable you have to assign a value to it.

<https://kotlinlang.org/docs/properties.html#late-initialized-properties-and-variables>

You probably have the following code:

```class MyClass {
    lateinit var clubEvent: ClubEvent
    var applicationDate = clubEvent[...]
}```
`applicationDate`'s initialization is trying to read a the uninitialized `clubEvent` property

If you are unable to figure things out going forward from this, better post in <#C0B8MA7FA|getting-started> with proper formatting, error messages and code snippets. They'll help you out. This is just essential Kotlin knowledge without any ties to Android. Further discussion should not take place in <#C0B8M7BUY|android> but rather <#C0B8MA7FA|getting-started>

Alright, thank you Ondrej for the help. I will try to figure it out myself with the links you provided and then turn to <#C0B8MA7FA|getting-started> if I need more help.

And also keep the discussion to a thread instead of posting another message at the top level