diff --git a/internal/httpclient/models/json_error.go b/internal/httpclient/models/json_error.go
new file mode 100644
index 00000000000..9819ea3551e
--- /dev/null
+++ b/internal/httpclient/models/json_error.go
@@ -0,0 +1,54 @@
+// Code generated by go-swagger; DO NOT EDIT.
+
+package models
+
+// This file was generated by the swagger tool.
+// Editing this file might prove futile when you re-run the swagger generate command
+
+import (
+	"github.com/go-openapi/strfmt"
+	"github.com/go-openapi/swag"
+)
+
+// JSONError Generic Error Response
+//
+// Error responses are sent when an error (e.g. unauthorized, bad request, ...) occurred.
+//
+// swagger:model jsonError
+type JSONError struct {
+
+	// Name is the error name.
+	Error string `json:"error,omitempty"`
+
+	// Debug contains debug information. This is usually not available and has to be enabled.
+	ErrorDebug string `json:"error_debug,omitempty"`
+
+	// Description contains further information on the nature of the error.
+	ErrorDescription string `json:"error_description,omitempty"`
+
+	// Code represents the error status code (404, 403, 401, ...).
+	StatusCode int64 `json:"status_code,omitempty"`
+}
+
+// Validate validates this json error
+func (m *JSONError) Validate(formats strfmt.Registry) error {
+	return nil
+}
+
+// MarshalBinary interface implementation
+func (m *JSONError) MarshalBinary() ([]byte, error) {
+	if m == nil {
+		return nil, nil
+	}
+	return swag.WriteJSON(m)
+}
+
+// UnmarshalBinary interface implementation
+func (m *JSONError) UnmarshalBinary(b []byte) error {
+	var res JSONError
+	if err := swag.ReadJSON(b, &res); err != nil {
+		return err
+	}
+	*m = res
+	return nil
+}
diff --git a/internal/httpclient/models/plugin_config_interface.go b/internal/httpclient/models/plugin_config_interface.go
index 43b13c30c2e..ccf8fc422dc 100644
--- a/internal/httpclient/models/plugin_config_interface.go
+++ b/internal/httpclient/models/plugin_config_interface.go
@@ -19,9 +19,6 @@ import (
 // swagger:model PluginConfigInterface
 type PluginConfigInterface struct {
 
-	// Protocol to use for clients connecting to the plugin.
-	ProtocolScheme string `json:"ProtocolScheme,omitempty"`
-
 	// socket
 	// Required: true
 	Socket *string `json:"Socket"`
diff --git a/oauth2/oauth2_auth_code_test.go b/oauth2/oauth2_auth_code_test.go
index 36d4eecece8..480415102e4 100644
--- a/oauth2/oauth2_auth_code_test.go
+++ b/oauth2/oauth2_auth_code_test.go
@@ -339,7 +339,7 @@ func TestAuthCodeWithDefaultStrategy(t *testing.T) {
 				WithLoginChallenge(r.URL.Query().Get("login_challenge")).
 				WithBody(&models.AcceptLoginRequest{Subject: pointerx.String(""), Remember: true}))
 			require.Error(t, err) // expects 400
-			assert.Contains(t, err.(*admin.AcceptLoginRequestBadRequest).Payload.Reason, "Field 'subject' must not be empty", "%+v", *err.(*admin.AcceptLoginRequestBadRequest).Payload)
+			assert.Contains(t, err.(*admin.AcceptLoginRequestBadRequest).Payload.ErrorDescription, "Field 'subject' must not be empty", "%+v", *err.(*admin.AcceptLoginRequestBadRequest).Payload)
 		}, testhelpers.HTTPServerNoExpectedCallHandler(t))
 		_, conf := newOAuth2Client(t, testhelpers.NewCallbackURL(t, "callback", testhelpers.HTTPServerNotImplementedHandler))
 
diff --git a/spec/api.json b/spec/api.json
index 2b42fa6b982..9f6e283c75e 100755
--- a/spec/api.json
+++ b/spec/api.json
@@ -2154,10 +2154,6 @@
         "Types"
       ],
       "properties": {
-        "ProtocolScheme": {
-          "description": "Protocol to use for clients connecting to the plugin.",
-          "type": "string"
-        },
         "Socket": {
           "description": "socket",
           "type": "string"