fix misaligned error

app.py

@@ -74,7 +74,7 @@ def calculate_sentence_metrics(reference, hypothesis):
         }
     except Exception as e:
         raise e
-
+        
 def identify_misaligned_sentences(reference_text, hypothesis_text):
     """
     Identify sentences that don't match between reference and hypothesis.
@@ -194,7 +194,8 @@ def main():
         def process_and_display(ref_file, hyp_file):
             result = process_files(ref_file, hyp_file)
             if "error" in result:
-                return {}, {}, {}, "Error: " + result["error"]
+                error_msg = result["error"]
+                return {"error": error_msg}, "", "", {"error": error_msg}
 
             metrics = {
                 "Overall WER": result["Overall WER"],