ErrConfigBackendRequired is thrown when no backend is supplied in a configuration.

ErrConfigInvalid is used to signal any configuration error that is not covered by the other config errors.

ErrConfigInvalidExportRegex is thrown when an invalid export regex is specified in a configuration.

ErrConfigInvalidImportRegex is thrown when an invalid import regex is specified in a configuration.

ErrConfigInvalidSourceURL is thrown when a source repository is specified without a valid URL.

ErrConfigPolicyMissing is thrown when no policy is specified in a configuration TODO: rename to ErrConfigPolicyMissing, the choice of using a default needs not be hardcoded here, so the term 'default' should not be used.

ErrConfigUnknownPolicy is thrown when an unknown/invalid policy is specified in a configuration.

ErrConfigValidationFailed is thrown when the validation of the configuration fails.

ErrConfigVersionNotDefined is thrown when no API version is specified in a configuration.

ErrConflictingStatements is thrown when two staments are not independent and cannot be merged with the current policy.

ErrNonIndependentStatements is thrown when two staments are not independent.

ErrNothingToReconcile is thrown when two staments are independent and no reconciliation is needed.

ErrUntrustedContributor is thrown when a contributor is not trusted.