diff --git a/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/exception/ErrorCode.kt b/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/exception/ErrorCode.kt
index c5ed06d..8f48601 100644
--- a/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/exception/ErrorCode.kt
+++ b/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/exception/ErrorCode.kt
@@ -2,13 +2,12 @@ package mobi.waterdog.rest.template.exception
 
 import io.ktor.http.HttpStatusCode
 
-enum class ErrorCode(val httpStatusCode: HttpStatusCode, val messageCode: String) {
-    // client errors
-    InvalidUserInput(HttpStatusCode.BadRequest, "client_error.invalid_parameters"),
-    NotFound(HttpStatusCode.NotFound, "client_error.not_found"),
+class ErrorCode(val httpStatusCode: HttpStatusCode, val messageCode: String)
 
-    // server errors
-    NotImplemented(HttpStatusCode.NotImplemented, "server_error.not_implemented")
+object ErrorCodes {
+    val InvalidUserInput = ErrorCode(HttpStatusCode.BadRequest, "client_error.invalid_parameters")
+    val NotFound = ErrorCode(HttpStatusCode.NotFound, "client_error.not_found")
 
-    // TODO fill with all possible app errors
+    // server errors
+    val NotImplemented = ErrorCode(HttpStatusCode.NotImplemented, "server_error.not_implemented")
 }
diff --git a/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/validation/Validatable.kt b/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/validation/Validatable.kt
index 8f56b0f..a21496f 100644
--- a/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/validation/Validatable.kt
+++ b/ktor-template-core/src/main/kotlin/mobi/waterdog/rest/template/validation/Validatable.kt
@@ -1,7 +1,7 @@
 package mobi.waterdog.rest.template.validation
 
 import mobi.waterdog.rest.template.exception.AppException
-import mobi.waterdog.rest.template.exception.ErrorCode
+import mobi.waterdog.rest.template.exception.ErrorCodes
 import mobi.waterdog.rest.template.exception.ErrorDefinition
 import org.valiktor.Constraint
 import org.valiktor.ConstraintViolationException
@@ -68,7 +68,7 @@ abstract class Validatable<T> {
 
     private fun valiktorException2AppException(valiktorEx: ConstraintViolationException): AppException {
         val validationException = AppException(
-            code = ErrorCode.InvalidUserInput,
+            code = ErrorCodes.InvalidUserInput,
             title = "Invalid content for class ${this::class.qualifiedName}, check invalid fields in errors"
         )
 
diff --git a/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/persistance/sql/PersonRepositoryImpl.kt b/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/persistance/sql/PersonRepositoryImpl.kt
index 49e5ab3..2fe0024 100644
--- a/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/persistance/sql/PersonRepositoryImpl.kt
+++ b/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/persistance/sql/PersonRepositoryImpl.kt
@@ -1,7 +1,7 @@
 package mobi.waterdog.rest.template.tests.core.persistance.sql
 
 import mobi.waterdog.rest.template.exception.AppException
-import mobi.waterdog.rest.template.exception.ErrorCode
+import mobi.waterdog.rest.template.exception.ErrorCodes
 import mobi.waterdog.rest.template.pagination.PageRequest
 import mobi.waterdog.rest.template.pagination.SortField
 import mobi.waterdog.rest.template.tests.core.model.Person
@@ -57,7 +57,7 @@ class PersonRepositoryImpl : PersonRepository {
             "name" -> Persons.name
             "birthday" -> Persons.birthday
             else -> throw AppException(
-                ErrorCode.NotImplemented,
+                ErrorCodes.NotImplemented,
                 "Sort by column '${sort.field}' in Person table not " +
                     "implemented."
             )
diff --git a/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/service/CarServiceImpl.kt b/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/service/CarServiceImpl.kt
index a2e046b..3561321 100644
--- a/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/service/CarServiceImpl.kt
+++ b/ktor-template-example/src/main/kotlin/mobi/waterdog/rest/template/tests/core/service/CarServiceImpl.kt
@@ -2,7 +2,7 @@ package mobi.waterdog.rest.template.tests.core.service
 
 import mobi.waterdog.rest.template.database.DatabaseConnection
 import mobi.waterdog.rest.template.exception.AppException
-import mobi.waterdog.rest.template.exception.ErrorCode
+import mobi.waterdog.rest.template.exception.ErrorCodes
 import mobi.waterdog.rest.template.pagination.PageRequest
 import mobi.waterdog.rest.template.tests.core.model.Car
 import mobi.waterdog.rest.template.tests.core.model.CarSaveCommand
@@ -43,7 +43,7 @@ class CarServiceImpl(
     override suspend fun updateCar(car: Car): Car {
         return dbc.suspendedQuery {
             if (!exists(car.id)) {
-                throw AppException(ErrorCode.NotFound, "Could not find car with id '${car.id}'.")
+                throw AppException(ErrorCodes.NotFound, "Could not find car with id '${car.id}'.")
             }
             carRepository.update(car)
         }