{"id":"8fddface7b8aa965","repo":"pallets/flask","slug":"no-root-path-can-be-found-for-the-provided-module","errorCode":null,"errorMessage":"No root path can be found for the provided module {import_name!r}. This can happen because the module came from an import hook that does not provide file name information or because it's a namespace package. In this case the root path needs to be explicitly provided.","messagePattern":"No root path can be found for the provided module (.+?)\\. This can happen because the module came from an import hook that does not provide file name information or because it's a namespace package\\. In this case the root path needs to be explicitly provided\\.","errorType":"exception","errorClass":"RuntimeError","httpStatus":null,"severity":"error","filePath":"src/flask/helpers.py","lineNumber":631,"sourceCode":"    # Loader does not exist or we're referring to an unloaded main\n    # module or a main module without path (interactive sessions), go\n    # with the current working directory.\n    if loader is None:\n        return os.getcwd()\n\n    if hasattr(loader, \"get_filename\"):\n        filepath = loader.get_filename(import_name)  # pyright: ignore\n    else:\n        # Fall back to imports.\n        __import__(import_name)\n        mod = sys.modules[import_name]\n        filepath = getattr(mod, \"__file__\", None)\n\n        # If we don't have a file path it might be because it is a\n        # namespace package. In this case pick the root path from the\n        # first module that is contained in the package.\n        if filepath is None:\n            raise RuntimeError(\n                \"No root path can be found for the provided module\"\n                f\" {import_name!r}. This can happen because the module\"\n                \" came from an import hook that does not provide file\"\n                \" name information or because it's a namespace package.\"\n                \" In this case the root path needs to be explicitly\"\n                \" provided.\"\n            )\n\n    # filepath is import_name.py for a module, or __init__.py for a package.\n    return os.path.dirname(os.path.abspath(filepath))  # type: ignore[no-any-return]\n\n\n@cache\ndef _split_blueprint_path(name: str) -> list[str]:\n    out: list[str] = [name]\n\n    if \".\" in name:\n        out.extend(_split_blueprint_path(name.rpartition(\".\")[0]))","sourceCodeStart":613,"sourceCodeEnd":649,"githubUrl":"https://github.com/pallets/flask/blob/6a2f545bfd8ed31e19066a299296917e034aca58/src/flask/helpers.py#L613-L649","documentation":"Flask(import_name) resolves the application's root_path by importing the named module and reading its __file__ so it can locate templates, static files, and instance folders. Namespace packages (PEP 420) and modules created by import hooks have no __file__, so get_root_path cannot derive a filesystem location and raises RuntimeError telling you to supply it explicitly.","triggerScenarios":"Flask('mypkg') where mypkg is a namespace package (a directory with no __init__.py, or a package split across multiple dirs); import_name pointing at a module loaded from a zip/frozen bundle or custom finder whose loader lacks get_filename and the module lacks __file__.","commonSituations":"Forgetting __init__.py in a src-layout package; PyInstaller/zipapp/frozen deployments; monorepos using implicit namespace packages for shared roots; passing a top-level namespace like 'company' instead of the concrete subpackage.","solutions":["Pass root_path explicitly: Flask(__name__, root_path=os.path.dirname(os.path.abspath(__file__))).","Add an __init__.py to the package so it becomes a regular package with __file__.","Use the concrete module's __name__ (Flask(__name__)) from a real .py file instead of a namespace package name.","In frozen apps, compute the bundle path (e.g. sys._MEIPASS for PyInstaller) and pass it as root_path."],"exampleFix":"# before\napp = Flask('company')  # 'company' is a namespace package\n# after\nimport os\napp = Flask(__name__, root_path=os.path.dirname(os.path.abspath(__file__)))","handlingStrategy":"validation","validationCode":"import importlib.util, os\nspec = importlib.util.find_spec(import_name)\nhas_file = spec is not None and spec.origin not in (None, 'namespace')\nroot = os.path.dirname(os.path.abspath(spec.origin)) if has_file else os.getcwd()\napp = Flask(import_name, root_path=root)","typeGuard":"import importlib.util\ndef module_has_root_path(import_name: str) -> bool:\n    spec = importlib.util.find_spec(import_name)\n    return spec is not None and spec.origin not in (None, 'namespace')","tryCatchPattern":null,"preventionTips":["Use Flask(__name__) from a real module file, not from a REPL, frozen executable, or namespace package","Pass root_path= explicitly when running under PyInstaller/zipapp/import hooks","Ensure your package has an __init__.py so it isn't treated as a namespace package"],"tags":["flask","packaging","namespace-package","root-path"],"analyzedSha":"6a2f545bfd8ed31e19066a299296917e034aca58","analyzedAt":"2026-07-31T19:13:49.921Z","schemaVersion":2}