Follow the interface again

lib/private/files/stream/encryption.php

@@ -471,4 +471,13 @@ class Encryption extends Wrapper {
 		return parent::stream_seek($position);
 	}
 
+	/**
+	 * @param string $path
+	 * @param array $options
+	 * @return bool
+	 */
+	public function dir_opendir($path, $options) {
+		return false;
+	}
+
 }