# Troubleshooting

> This section describes issues you might have while using Python SDK.

## General issues

### I'm getting some inconsistent behavior when re-initializing `unity_cloud` once it has been disposed

When the Python SDK is disposed and re-initialized multiple times in the same lifetime of an application, some behaviors break. The workaround is to simply avoid disposing of any modules.

### I get a "Python quit unexpectedly" error when I run the Python SDK on macOS

When you use the Python SDK with the built-in Python version on macOS, you might encounter a **Python quit unexpectedly** error. This is a known issue with the system Python version. To prevent it, use a virtual environment or install Python with [Homebrew](https://brew.sh/).

## Service account issues

### Some methods return an exception

When using a service account as the authorization method, some calls to the Python SDK will return errors. Calls to the `identity` module's method will break. This is a known issues and should be resolved in a timely fashion.
All calls to the `user_login` module will, in turn, return an invalid operation exception. This is by design as this module becomes unavailable when using the `service_account` module.

## I have metadata and field definition errors

When adding a metadata dictionary during any entities creation or update, any error in either the key or the value can result in a validation error from the back-end.
Make sure the key passed is the right one.

To identify which key is the right key to use, call unity\_cloud.assets.list\_field\_definitions and inspect your field to get the exact key.

As for value errors, they will depend on the type of the field definition. To avoid these errors, do as follows:

* For `select` and `multiselect` fields, make sure you are using an exact value contained in the `accepted_values`.
* For timestamp, the value must be a UTC datetime respecting the ISO 8601 format.
* For url, the value must be a valid URL beginning with either http\:// or https\://.
* For user, the value must be a valid user ID.