Sometimes when you're building an app, things don't go as planned and an error occurs.

When in doubt, check the error returned, and see what the error message says.

If you've checked the error message and have Cloud Storage Security Rules that allow your action, but are still struggling to fix the error, visit our Support page and let us know how we can help.

Handle Error Messages

There are a number of reasons why errors may occur, including the file not existing, the user not having permission to access the desired file, or the user cancelling the file upload.

To properly diagnose the issue and handle the error, here is a full list of all the errors our client will raise, and how they can occur.

Name	Reason
kErrorNone	There was no error.
kErrorUnknown	An unknown error occurred.
kErrorObjectNotFound	No object exists at the specified reference.
kErrorBucketNotFound	No bucket is configured for Cloud Storage.
kErrorProjectNotFound	No project is configured for Cloud Storage.
kErrorQuotaExceeded	Quota on your bucket has been exceeded. Cloud Storage for Firebase requires the pay-as-you-go Blaze pricing plan. If you're receiving this error on a Spark pricing plan project, you must upgrade to the Blaze pricing plan to regain access. For details, see our FAQ.
kErrorUnauthenticated	User is unauthenticated. Authenticate and try again.
kErrorUnauthorized	User is not authorized to perform the requested action. Check your rules to ensure they are correct.
kErrorRetryLimitExceeded	The maximum time limit on an operation (upload, download, delete, etc.) has been exceeded. Try uploading again.
kErrorNonMatchingChecksum	File on the client does not match the checksum of the file received by the server. Try uploading again.
kErrorCanceled	User canceled the operation.
kErrorDownloadSizeExceeded	Size of the downloaded file exceeds the amount of memory allocated for the download. Increase memory cap and try downloading again.