diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
index a5f33c5..ca4211d 100644
--- a/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
+++ b/src/main/kotlin/ru/kotlin/homework/network/NetworkLogger.kt
@@ -15,9 +15,9 @@ sealed class ApiException(message: String) : Throwable(message) {
     data object UnknownException: ApiException("Unknown exception")
 }
 
-class ErrorLogger<E : Throwable> {
+class ErrorLogger<in E : Throwable> {
 
-    val errors = mutableListOf<Pair<LocalDateTime, E>>()
+   private val errors = mutableListOf<Pair<LocalDateTime, E>>()
 
     fun log(response: NetworkResponse<*, E>) {
         if (response is Failure) {
@@ -30,6 +30,8 @@ class ErrorLogger<E : Throwable> {
             println("Error at $date: ${error.message}")
         }
     }
+
+    fun dump(): List<Pair<LocalDateTime, *>> = errors
 }
 
 fun processThrowables(logger: ErrorLogger<Throwable>) {
diff --git a/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt b/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
index 3018c40..45d7641 100644
--- a/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
+++ b/src/main/kotlin/ru/kotlin/homework/network/NetworkResponse.kt
@@ -9,19 +9,19 @@ import java.time.LocalDateTime
 /**
  * Network result
  */
-sealed class NetworkResponse<T, R> {
+sealed class NetworkResponse<out T, out R> {
     val responseDateTime: LocalDateTime = LocalDateTime.now()
 }
 
 /**
  * Network success
  */
-data class Success<T, R>(val resp: T): NetworkResponse<T, R>()
+data class Success<out T>(val resp: T): NetworkResponse<T, Nothing>()
 
 /**
  * Network error
  */
-data class Failure<T, R>(val error: R): NetworkResponse<T, R>()
+data class Failure<out R>(val error: R): NetworkResponse<Nothing, R>()
 
 val s1 = Success("Message")
 val r11: NetworkResponse<String, Error> = s1