Can't fix error: Cannot find symbol class ActivityMainBindingImpl

I've got following error while trying to build prject with MVVM and data binding. I've searched through everything I could find here on StackOverflow, or common mistakes on the internet, but nothing worked for my case.
The only message I receive is this error. It looks like this in buildOutput:

I've had my packages named with capital letters and I've found here that this might be the cause because compiler treat them as names of classes, so I've changed them all to start with small letters, but that haven't helped.

I've created ViewModelFactory for creating my ViewModel inside Activity so I could send additional parameters with constructor using factory, so I've tried to remove it and use no parameters and create instance without using factory for this purpose, but still I havn't got any results (same error)

I was chaning both build.gradle's in different ways but result was always the same.
Finally I've deleted data binding and variable from XML, then I was able to run the app (with other errors, but I would be probably able to deal with those by myself) but I want to leave it as it is and just deal with my error.

I am not experienced with MVVM and data binding so it can be just a stupid mistake, but it is hard to find it if I don't know where I should look for it.

Here I post most important codes, if you need more then let me know:

build.grale(app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 30
    buildToolsVersion "29.0.3"

    defaultConfig {
        applicationId "com.example.rickmorty"
        minSdkVersion 24
        targetSdkVersion 30
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    buildFeatures{
        dataBinding = true
        viewBinding = true
    }
}

dependencies {
    implementation fileTree(dir: "libs", include: ["*.jar"])
    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.3.1'
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'com.google.android.material:material:1.3.0-alpha02'
    implementation "android.arch.lifecycle:extensions:1.1.1"
    implementation "androidx.cardview:cardview:1.0.0"
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'

    implementation 'com.squareup.retrofit2:adapter-rxjava2:2.3.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'

    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
    implementation 'io.reactivex.rxjava2:rxjava:2.1.7'

    implementation 'com.github.bumptech.glide:glide:4.6.1'
    kapt 'com.github.bumptech.glide:compiler:4.4.0'
}

**build.gradle(project)

buildscript {
    ext.kotlin_version = "1.3.72"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.0"
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

MainActivity

class MainActivity : AppCompatActivity() {

    lateinit var mainViewModel: MainViewModel
    lateinit var mAdapter: CharactersAdapter
    lateinit var api: CharacterAPI

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val retrofit = RetrofitClient.instance
        api = retrofit.create(CharacterAPI::class.java)
        setupViewModel()
        setupRecycler()

        mainViewModel.getData().observe(this,
            Observer<List<Results>> { t ->
                mAdapter = CharactersAdapter(this@MainActivity, t!!)
                rvCharacters.adapter = mAdapter
            })
    }

    fun setupRecycler() {
        val lManager = LinearLayoutManager(this@MainActivity)
        rvCharacters.apply {
            setHasFixedSize(true)
            layoutManager = lManager
        }
        rvCharacters.addOnScrollListener(object : RecyclerView.OnScrollListener() {
            override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
                super.onScrolled(recyclerView, dx, dy)
                val visibleItems = lManager.childCount
                val totalItems = lManager.itemCount
                val firstVisible = lManager.findFirstVisibleItemPosition()
                if (dy > 0) {
                    if (!mainViewModel.isLoading.value!! && (visibleItems + firstVisible) >= totalItems) {
                        mainViewModel.scrolledNext()
                    }
                } else {
                    if (!mainViewModel.isLoading.value!! && (totalItems - visibleItems) <= 0) {
                        mainViewModel.scrolledPrev()
                    }
                }
            }

        })
    }

    fun setupViewModel() {
        mainViewModel = ViewModelProviders.of(this, MainViewModelFactory(application, api))
            .get(MainViewModel::class.java)
        DataBindingUtil.setContentView<ActivityMainBinding>(
            this, R.layout.activity_main
        ).apply {
            lifecycleOwner = this@MainActivity
            viewmodel = mainViewModel
        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">
    <data>
        <variable
            name="viewmodel"
            type="com.example.rickmorty.ViewModel.MainViewModel"/>
    </data>
    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MainActivity">

        <RelativeLayout
            android:id="@+id/rlPageTitleHolder"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintTop_toTopOf="parent"
            app:layout_constraintHeight_percent="0.1">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="24sp"
                android:layout_centerInParent="true"
                android:text="@{() -> viewmodel.pageNumber}"/>
        </RelativeLayout>

        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rvCharacters"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            app:layout_constraintTop_toBottomOf="@id/rlPageTitleHolder"
            app:layout_constraintHeight_percent="0.9"/>

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

As I wrote earlier, after removing variable from XML and binding from MainActivity error disappears. I know it is a lot of code, so if something is redundant just let me know. There is factory class still missing, but I will post it if it's necessary. Also MainRepo is one I haven't attached here, but it's quite long, but I can post it all if you're gonna need it.