reflex-dev/reflex · error · EnvironmentVarValueError

Path does not exist: {path!r} for {field_name}

Error message

Path does not exist: {path!r} for {field_name}

What it means

interpret_existing_path_env requires the given path to exist on disk; Path(value).exists() failing raises EnvironmentVarValueError. Used for config fields that must point at an existing file or directory.

Source

Thrown at packages/reflex-base/src/reflex_base/environment.py:135

def interpret_existing_path_env(value: str, field_name: str) -> ExistingPath:
    """Interpret a path environment variable value as an existing path.

    Args:
        value: The environment variable value.
        field_name: The field name.

    Returns:
        The interpreted value.

    Raises:
        EnvironmentVarValueError: If the path does not exist.
    """
    path = Path(value)
    if not path.exists():
        msg = f"Path does not exist: {path!r} for {field_name}"
        raise EnvironmentVarValueError(msg)
    return path


def interpret_path_env(value: str, field_name: str) -> Path:
    """Interpret a path environment variable value.

    Args:
        value: The environment variable value.
        field_name: The field name.

    Returns:
        The interpreted value.
    """
    return Path(value)


@dataclasses.dataclass
class _InvalidPlugin(Plugin):

View on GitHub (pinned to 45b8ed5ab7)

Solutions

1. Verify the path exists at runtime (ls / check mount)
2. Fix the path: absolute path, correct working directory, or mount the file into the container
3. Create the expected file/directory if it's app-owned

Example fix

# before
SSL_CERT=/etc/ssl/cert.pem  # not mounted
# after (docker)
volumes: ["./certs/cert.pem:/etc/ssl/cert.pem:ro"]

from pathlib import Path
p = Path(os.environ["SSL_CERT"])
if not p.exists():
    raise SystemExit(f"SSL_CERT path does not exist: {p}")

def is_existing_path(v: str) -> bool:
    return Path(v).exists()

except EnvironmentVarValueError:
    p = Path("./default/cert.pem")  # fallback if it exists

When it happens

Trigger: Setting a path-typed env var (annotated as ExistingPath) to a missing file/directory, e.g. SSL_CERT=/etc/ssl/cert.pem when the file isn't mounted.

Common situations: Docker volumes not mounted, running from a different working directory with relative paths, or referencing files not present in the deployment image.

Related errors

• Invalid boolean value: {value!r} for {field_name}
• Invalid integer value: {value!r} for {field_name}
• Invalid float value: {value!r} for {field_name}
• Invalid plugin value: {value!r} for {field_name}. Plugin nam
• Invalid enum value: {value!r} for {field_name}

AI-assisted analysis of reflex-dev/reflex@45b8ed5ab7 (2026-08-28). Data as JSON: /api/errors/89cd4a13c18e3c49. Report an issue: GitHub.