Fixed import with custom vocabs.

src/Mvc/Controller/Plugin/Bulk.php

@@ -711,7 +711,7 @@ public function getCustomVocabBaseType(string $name): ?string
 
         if (is_null($customVocabTypes)) {
             $customVocabTypes = [];
-            $types = $this->viewHelpers()->get('customVocabBaseType')();
+            $types = $this->services->get('ViewHelperManager')->get('customVocabBaseType')();
             foreach ($types as $id => $type) {
                 $customVocabTypes[$id] = $type;
                 $customVocabTypes["customvocab:$id"] = $type;