[nbc] Add missing import

diff --git a/youtube_dl/extractor/nbc.py b/youtube_dl/extractor/nbc.py
index 70aa98aee3e5d3044080e6a5d2d1605955cda49e..d2e4acbada5b99c5c3eac4fe6b966ce77dab1ef9 100644 (file)
--- a/youtube_dl/extractor/nbc.py
+++ b/youtube_dl/extractor/nbc.py
@@ -4,7 +4,11 @@ import re
 import json
 
 from .common import InfoExtractor
-from ..utils import find_xpath_attr, compat_str
+from ..utils import (
+    compat_str,
+    ExtractorError,
+    find_xpath_attr,
+)
 
 
 class NBCIE(InfoExtractor):