bug-fix: fixing sub-process

app.py

@@ -13,10 +13,13 @@ def generate_html(text_input, length):
         "--text", text_input,
         "--length", str(length)
     ]
-    # Run the command
-    subprocess.run(command, check=True)
-    # Return the path of the latest HTML file in the output directory
-    return find_latest_html_file('output')
+    try:
+        # Capture the standard error output
+        result = subprocess.run(command, check=True, text=True, capture_output=True)
+        return find_latest_html_file('output')
+    except subprocess.CalledProcessError as e:
+        print("Error:", e.stderr)  # Print the error message from stderr
+        return None
 
 # Function to find the latest HTML file in the specified directory
 def find_latest_html_file(base_path):