extract config error handling out of app.js

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/ErrorView.tsx

@@ -0,0 +1,40 @@
+/*
+Copyright 2020 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import * as React from "react";
+import * as PropTypes from "prop-types";
+
+interface IProps {
+    title: React.ReactNode;
+    message: React.ReactNode;
+}
+
+const ErrorView: React.FC<IProps> = ({title, message}) => {
+    return <div className="mx_GenericErrorPage">
+        <div className="mx_GenericErrorPage_box">
+            <h1>{ title }</h1>
+            <p>{ message }</p>
+        </div>
+    </div>;
+};
+
+ErrorView.propTypes = {
+    title: PropTypes.object.isRequired, // jsx for title
+    message: PropTypes.object.isRequired, // jsx to display
+};
+
+export default ErrorView;
+