Fixed: Show errors when adding Root Folder

(cherry picked from commit 16d60a6586aeb458601214258da021ee154e5b6e)

Closes #9527

frontend/src/AddMovie/ImportMovie/SelectFolder/ImportMovieSelectFolder.js

@@ -148,7 +148,7 @@ class ImportMovieSelectFolder extends Component {
                       className={styles.addErrorAlert}
                       kind={kinds.DANGER}
                     >
-                      {translate('UnableToAddRootFolder')}
+                      {translate('AddRootFolderError')}
 
                       <ul>
                         {

frontend/src/RootFolder/RootFolders.tsx

@@ -49,7 +49,7 @@ function RootFolders() {
 
   if (!isFetching && !!error) {
     return (
-      <Alert kind={kinds.DANGER}>{translate('UnableToLoadRootFolders')}</Alert>
+      <Alert kind={kinds.DANGER}>{translate('RootFoldersLoadError')}</Alert>
     );
   }
 

frontend/src/Settings/MediaManagement/RootFolder/AddRootFolder.tsx

@@ -1,14 +1,18 @@
 import React, { useCallback, useState } from 'react';
-import { useDispatch } from 'react-redux';
+import { useDispatch, useSelector } from 'react-redux';
+import Alert from 'Components/Alert';
 import FileBrowserModal from 'Components/FileBrowser/FileBrowserModal';
 import Icon from 'Components/Icon';
 import Button from 'Components/Link/Button';
 import { icons, kinds, sizes } from 'Helpers/Props';
 import { addRootFolder } from 'Store/Actions/rootFolderActions';
+import createRootFoldersSelector from 'Store/Selectors/createRootFoldersSelector';
 import translate from 'Utilities/String/translate';
 import styles from './AddRootFolder.css';
 
 function AddRootFolder() {
+  const { isSaving, saveError } = useSelector(createRootFoldersSelector());
+
   const dispatch = useDispatch();
 
   const [isAddNewRootFolderModalOpen, setIsAddNewRootFolderModalOpen] =
@@ -30,24 +34,42 @@ function AddRootFolder() {
   }, [setIsAddNewRootFolderModalOpen]);
 
   return (
-    <div className={styles.addRootFolderButtonContainer}>
-      <Button
-        kind={kinds.PRIMARY}
-        size={sizes.LARGE}
-        onPress={onAddNewRootFolderPress}
-      >
-        <Icon className={styles.importButtonIcon} name={icons.DRIVE} />
-        {translate('AddRootFolder')}
-      </Button>
+    <>
+      {!isSaving && saveError ? (
+        <Alert kind={kinds.DANGER}>
+          {translate('AddRootFolderError')}
 
-      <FileBrowserModal
-        isOpen={isAddNewRootFolderModalOpen}
-        name="rootFolderPath"
-        value=""
-        onChange={onNewRootFolderSelect}
-        onModalClose={onAddRootFolderModalClose}
-      />
-    </div>
+          <ul>
+            {Array.isArray(saveError.responseJSON) ? (
+              saveError.responseJSON.map((e, index) => {
+                return <li key={index}>{e.errorMessage}</li>;
+              })
+            ) : (
+              <li>{JSON.stringify(saveError.responseJSON)}</li>
+            )}
+          </ul>
+        </Alert>
+      ) : null}
+
+      <div className={styles.addRootFolderButtonContainer}>
+        <Button
+          kind={kinds.PRIMARY}
+          size={sizes.LARGE}
+          onPress={onAddNewRootFolderPress}
+        >
+          <Icon className={styles.importButtonIcon} name={icons.DRIVE} />
+          {translate('AddRootFolder')}
+        </Button>
+
+        <FileBrowserModal
+          isOpen={isAddNewRootFolderModalOpen}
+          name="rootFolderPath"
+          value=""
+          onChange={onNewRootFolderSelect}
+          onModalClose={onAddRootFolderModalClose}
+        />
+      </div>
+    </>
   );
 }