Update app.py

app.py

@@ -258,7 +258,7 @@ def run_iqtree_analysis(aligned_fasta, output_prefix, iqtree_cmd):
         else:
             error_msg = result.stderr.strip() if result.stderr else "Unknown IQ-TREE error"
             logging.error(f"IQ-TREE failed: {error_msg}")
-            return False, f"IQ-TREE error: {error_msg}")
+            return False, f"IQ-TREE error: {error_msg}"
             
     except subprocess.TimeoutExpired:
         logging.error("IQ-TREE timeout")