diff --git a/mitmproxy2swagger/mitmproxy2swagger.py b/mitmproxy2swagger/mitmproxy2swagger.py
index 80968fe..26194de 100755
--- a/mitmproxy2swagger/mitmproxy2swagger.py
+++ b/mitmproxy2swagger/mitmproxy2swagger.py
@@ -212,6 +212,11 @@ def main():
 
     except FlowReadException as e:
         print(f"Flow file corrupted: {e}")
+        traceback.print_exception(*sys.exc_info())
+        print(f"{console_util.ANSI_RED}Failed to parse the input file as '{caputre_reader.name()}'. ")
+        if not args.format:
+            print(f"It might happen that the input format as incorrectly detected. Please try using '--fromat flow' or '--format har' to specify the input format.{console_util.ANSI_RESET}")
+        sys.exit(1)
     except ValueError as e:
         print(f"ValueError: {e}")
         # print stack trace