diff --git a/apps/application/serializers/application_serializers.py b/apps/application/serializers/application_serializers.py
index 41c6d29fe..cb91e465d 100644
--- a/apps/application/serializers/application_serializers.py
+++ b/apps/application/serializers/application_serializers.py
@@ -131,7 +131,7 @@ class ApplicationSerializer(serializers.Serializer):
         desc = serializers.CharField(required=False)
         model_id = serializers.CharField(required=False)
         multiple_rounds_dialogue = serializers.BooleanField(required=False)
-        prologue = serializers.CharField(required=False)
+        prologue = serializers.CharField(required=False, allow_null=True, allow_blank=True)
         example = serializers.ListSerializer(required=False, child=serializers.CharField(required=True))
         dataset_id_list = serializers.ListSerializer(required=False, child=serializers.UUIDField(required=True))
 
diff --git a/main.py b/main.py
index 1a702706f..6f7480807 100644
--- a/main.py
+++ b/main.py
@@ -48,7 +48,7 @@ def start_services():
 
 
 if __name__ == '__main__':
-    os.environ['TRANSFORMERS_CACHE'] = '/opt/maxkb/model/base'
+    os.environ['HF_HOME'] = '/opt/maxkb/model/base'
     parser = argparse.ArgumentParser(
         description="""
            qabot service control tools;