Update app.py

app.py

@@ -104,7 +104,7 @@ async def chat(query,history,sources,reports,subtype,year):
 
     ##------------------------decide which collection to fetch------------------------------
     if len(reports) == 0:
-        vectorstore = vectorstores[source]
+        vectorstore = vectorstores[sources]
     else:
         vectorstore = vectorstores["allreports"]