Update app.py

app.py

@@ -210,7 +210,7 @@ class SpaceBuilder:
         ):
             return "Please fill all the inputs"
         if hf_token == "" or hf_token.isspace():
-            hf_token = os.environ('HF_SELF_TOKEN')
+            hf_token = os.environ['HF_SELF_TOKEN']
         if not SpaceBuilder.check_space_name_availability(hf_token=hf_token, space_name=target_space_name):
             return SpaceBuilder.error_message
         if not SpaceBuilder.load_and_check_spaces(names=space_names):