Unresolved references in installedAppsPlugin.kt

[manuel3053]

~/.pub-cache/hosted/pub.dev/installed_apps-1.5.1/android/src/main/kotlin/com/sharmadhiraj/installed_apps/InstalledAppsPlugin.kt:
22:48 Unresolved reference 'Registrar'.
33:37 Unresolved reference 'Registrar'.
34:33 Unresolved reference 'context'.
35:32 Unresolved reference 'messenger'.

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':installed_apps:compileDebugKotlin'.

A failure occurred while executing org.jetbrains.kotlin.compilerRunner.GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
Compilation error. See log for more details

I tried to downgrade to 1.5.1 but nothing changed.