import os

def main():
    try:
        # Ensure the app module is correctly named
        app_module = "app"
        if not os.path.exists(f"{app_module}.py"):
            raise ImportError(f"Module '{app_module}' not found.")

        # Ensure there are no syntax errors
        with open(f"{app_module}.py", "r") as file:
            code = file.read()
            compile(code, f"{app_module}.py", 'exec')

        # Ensure there are no import errors
        import app

        # Ensure the app attribute exists in the app module
        if not hasattr(app, "app"):
            raise AttributeError(f"Attribute 'app' not found in module '{app_module}'.")

        print("App module is correctly named, has no syntax errors, no import errors, and contains the 'app' attribute.")
    except ImportError as e:
        print(f"ImportError: {e}")
    except SyntaxError as e:
        print(f"SyntaxError: {e}")
    except AttributeError as e:
        print(f"AttributeError: {e}")
    except Exception as e:
        print(f"Error: {e}")

# Add an `app` attribute to the module
app = main

if __name__ == "__main__":
    main()