What do common sandbox SDK error messages mean?

The following table summarizes the most common exceptions that the SDK raises, along with their typical causes and recommended fixes.

Error	Cause	Solution
`CWSandboxAuthenticationError`	Missing or invalid credentials	Check the credential for your selected authentication method
`SandboxNotRunningError`	Operation on stopped sandbox	Check `sandbox.status` before operations
`SandboxTimeoutError`	Operation exceeded timeout	Increase `timeout_seconds` or optimize command
`SandboxTerminatedError`	Sandbox ended externally	Check `max_lifetime_seconds` or external termination
`SandboxFailedError`	Sandbox failed to start	Check container image and resources
`SandboxNotFoundError`	Sandbox deleted or never existed	Verify sandbox ID is correct
`SandboxExecutionError`	Command returned non-zero (with `check=True`)	Check `e.exec_result.stderr` for details
`SandboxFileError`	File operation failed	Check file path and permissions
`FunctionSerializationError`	Can’t serialize function args	Use JSON-serializable types or `Serialization.PICKLE`
`AsyncFunctionError`	Async function passed to `@session.function()`	Use sync functions only