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.