<Kotlin Type mismatch, required: x found: x?> I fi...

# stackoverflow

[user]

Kotlin Type mismatch, required: x found: x?
I find a lot of arguments have the error

Type mismatch
required: FragmentActivity
found: FragmentActivity?


I'm not sure of what's the best way to address this problem.
Currently, I wrap the line in a variable?.let{ statement }

meViewModel = ViewModelProviders.of((iMainActivity as Fragment).activity, vmf).get(MeViewModel::class.java) }


into

val fragmentActivity = (iMainActivity as Fragment).activity

fragmentActivity?.let
{
meViewModel = ViewModelProviders.of(fragmentActivity,...