correct checkfile

app.py

@@ -1381,9 +1381,12 @@ def CheckFileinResp(response):
     except Exception as e:
         print("No wav found:", e)
         try:
-            file = response.split("(sandbox:/")[-1].split(")")[0]
-            print("File found:", file)
-            return file
+            if '(sandbox:/' in response:
+                file = response.split("(sandbox:/")[-1].split(")")[0]
+                print("File found:", file)
+                return file
+            else:
+                return "N/A"
         except Exception as e:
             return "N/A"