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This happens when i extend from an abstract base fragment like so:

public abstract class BaseFragment<T extends BasePresenter, E extends BaseModel> extends Fragment {
, but the app still build without any errors. below is my build.gradle config:
android {
    compileSdkVersion 27
    buildToolsVersion '26.0.2'
    defaultConfig
        multiDexEnabled true
        minSdkVersion 21
        targetSdkVersion 27
                I am trying to create a utility class using this observer. I am receiving the same issue even when passing in the Activity as a parameter to my function. This only seems to work if you use in an Activity.
– portfoliobuilder
                Nov 29, 2018 at 19:03
  
LifecycleOwner : A class that has an Android lifecycle. These events can be used by
  custom components to handle lifecycle changes without implementing any
  code inside the Activity or the Fragment.
To access LifecycleOwner class add following dependency in your app build.gradle file.
implementation "android.arch.lifecycle:extensions:1.1.1"
Solution 2: 
Add following support compat dependency in your app build.gradle file.
implementation 'com.android.support:support-compat:27.1.1'
                Why in solution-1 we need to add that dependency, and why adding it will solve the problem?
– LaraFlow
                Sep 3, 2019 at 14:51
I have faced the same issue and I resolved this issue by updating android support libraries in build.gradle file.
I would recommend updating your android support libraries to 27.1.1 or newer. No need to add this :
implementation 'android.arch.lifecycle:extensions:1.1.1'  (not recommended)
If the following dependency is not added in your app level's build.gradle then add it: 
implementation "android.arch.lifecycle:extensions:1.1.1" 
and sync the project with 
gradle files.
If it is already added then:
a. Go to Tools-> Clean Project
b. Rebuild Project
c. Go to File-> Invalidate Caches and Restart
        
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