diff --git a/internal/domain/error.go b/internal/domain/error.go
index 3fcfc89..0941fe7 100644
--- a/internal/domain/error.go
+++ b/internal/domain/error.go
@@ -32,7 +32,7 @@ func (e ErrorCode) String() string {
 	}
 }
 
-type UserError interface {
+type Error interface {
 	error
 	UserError() string
 	Code() ErrorCode
diff --git a/internal/domain/error_test.go b/internal/domain/error_test.go
index a365bff..8f31ce3 100644
--- a/internal/domain/error_test.go
+++ b/internal/domain/error_test.go
@@ -26,7 +26,7 @@ func TestValidationError(t *testing.T) {
 			Min: 25,
 		},
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, fmt.Sprintf("%s: %s", err.Field, err.Err.Error()), err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.ErrorIs(t, err, err.Err)
@@ -39,7 +39,7 @@ func TestMinError(t *testing.T) {
 	err := domain.MinError{
 		Min: 25,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "must be no less than 25", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeValidationError, err.Code())
@@ -51,7 +51,7 @@ func TestMaxError(t *testing.T) {
 	err := domain.MaxError{
 		Max: 25,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "must be no greater than 25", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeValidationError, err.Code())
@@ -63,7 +63,7 @@ func TestMaxLengthError(t *testing.T) {
 	err := domain.MaxLengthError{
 		Max: 25,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "the length must be no more than 25", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeValidationError, err.Code())
diff --git a/internal/domain/player_test.go b/internal/domain/player_test.go
index dc8f00a..cf0704a 100644
--- a/internal/domain/player_test.go
+++ b/internal/domain/player_test.go
@@ -75,7 +75,7 @@ func TestPlayerNotFoundError(t *testing.T) {
 	err := domain.PlayerNotFoundError{
 		ID: 1234,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "player (id=1234) not found", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeEntityNotFound, err.Code())
diff --git a/internal/domain/server_test.go b/internal/domain/server_test.go
index ddd1009..43a3837 100644
--- a/internal/domain/server_test.go
+++ b/internal/domain/server_test.go
@@ -146,7 +146,7 @@ func TestServerNotFoundError(t *testing.T) {
 	err := domain.ServerNotFoundError{
 		Key: "pl151",
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "server (key=pl151) not found", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeEntityNotFound, err.Code())
diff --git a/internal/domain/tribe_test.go b/internal/domain/tribe_test.go
index 881e847..ef8385e 100644
--- a/internal/domain/tribe_test.go
+++ b/internal/domain/tribe_test.go
@@ -76,7 +76,7 @@ func TestTribeNotFoundError(t *testing.T) {
 	err := domain.TribeNotFoundError{
 		ID: 1234,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "tribe (id=1234) not found", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeEntityNotFound, err.Code())
diff --git a/internal/domain/version_test.go b/internal/domain/version_test.go
index 70c9274..69a84c5 100644
--- a/internal/domain/version_test.go
+++ b/internal/domain/version_test.go
@@ -13,7 +13,7 @@ func TestVersionNotFoundError(t *testing.T) {
 	err := domain.VersionNotFoundError{
 		VerCode: "pl",
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "version (code=pl) not found", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeEntityNotFound, err.Code())
diff --git a/internal/domain/village_test.go b/internal/domain/village_test.go
index 5bb661a..6c56b10 100644
--- a/internal/domain/village_test.go
+++ b/internal/domain/village_test.go
@@ -46,7 +46,7 @@ func TestVillageNotFoundError(t *testing.T) {
 	err := domain.VillageNotFoundError{
 		ID: 1234,
 	}
-	var _ domain.UserError = err
+	var _ domain.Error = err
 	assert.Equal(t, "village (id=1234) not found", err.Error())
 	assert.Equal(t, err.Error(), err.UserError())
 	assert.Equal(t, domain.ErrorCodeEntityNotFound, err.Code())
diff --git a/internal/router/rest/rest.go b/internal/router/rest/rest.go
index 9e8951c..ef82b82 100644
--- a/internal/router/rest/rest.go
+++ b/internal/router/rest/rest.go
@@ -195,7 +195,7 @@ func (e internalServerError) Unwrap() error {
 }
 
 func renderErr(w http.ResponseWriter, err error) {
-	var userError domain.UserError
+	var userError domain.Error
 	if !errors.As(err, &userError) {
 		userError = internalServerError{err: err}
 	}