| Class | NoSuchProduct | There's no such product registered in Launchpad. |
| Class | NoSuchPerson | There's no Person with the specified email registered in Launchpad. |
| Class | NoSuchBranch | There's no Branch with the specified URL registered in Launchpad. |
| Class | NoSuchBug | There's no Bug with the specified id registered in Launchpad. |
| Class | BranchAlreadyRegistered | A branch with the same URL is already registered in Launchpad. |
| Class | FileBugMissingProductOrDistribution | No product or distribution specified when filing a bug. |
| Class | FileBugGotProductAndDistro | A distribution and product were specified when filing a bug. |
| Class | NoSuchDistribution | There's no such distribution registered in Launchpad. |
| Class | NoSuchPackage | There's no source or binary package with the name provided. |
| Class | RequiredParameterMissing | A required parameter was not provided. |
| Class | BranchCreationForbidden | The user was not permitted to create a branch. |
| Class | InvalidBranchUrl | The provided branch URL is not valid. |
| Class | BranchUniqueNameConflict | There is already a branch with this unique name. |
| Class | NoSuchTeamMailingList | There is no such team mailing list with the given name. |
| Class | UnexpectedStatusReport | A team mailing list received an unexpected status report. |
| Class | BadStatus | A bad status string was received. |
| Class | NoLinkedBranch | The object has no branch registered with it. |
| Class | NoSuchProductSeries | There is no such series on a particular project. |
| Class | InvalidBranchIdentifier | The branch identifier didn't begin with a tilde. |
| Class | NoSuchPersonWithName | There's no Person with the specified name registered in Launchpad. |
| Class | BranchNameInUse | There is already a branch with this name for this product. |
| Class | CannotHaveLinkedBranch | Raised when we get a linked branch for a thing that can't have any. |
| Class | InvalidProductName | Raised when we are passed an invalid name for a product. |
| Class | NotInTeam | Raised when a person needs to be a member of a team, but is not. |
| Class | InvalidBranchName | The branch name is not allowed by Launchpad. |
| Class | NoBranchWithID | There's no branch with the given ID. |
| Class | NoUrlForBranch | resolve_lp_path resolved to a remote branch with no URL. |
| Class | PathTranslationError | Raised when a virtual path cannot be translated to a real one. |
| Class | GitRepositoryNotFound | Raised when a Git repository path lookup fails. |
| Class | InvalidPath | Raised when translatePath is passed something that's not a path. |
| Class | PermissionDenied | Raised when a user is denied access to some resource. |
| Class | NotFound | Raised when a resource is not found. |
| Class | InvalidBranchUniqueName | Raised when a user tries to resolve a unique name that's incomplete. |
| Class | NoSuchDistroSeries | Raised when the user tries to get a distroseries that doesn't exist. |
| Class | NoSuchSourcePackageName | Raised when the user tries to get a sourcepackage that doesn't exist. |
| Class | NoSuchCodeImportJob | Raised by ICodeImportScheduler methods when a job is not found. |
| Class | OopsOccurred | An oops has occurred performing the requested operation. |
| Class | InvalidSourcePackageName | Undocumented |
| Class | Unauthorized | Permission was denied, but authorisation may help. |