Module errors 

Structs

BackendError

BackendError is the error for backend.

DownloadFromParentFailed

DownloadFromParentFailed is the error when the download from parent is failed.

ExternalError

ExternalError is the external error.

Enums

ErrorType

ErrorType is the type of the error.

Traits

OrErr

OrErr is the trait to extend the result with error.