API Reference > itwin-client > iTwinServiceClients > AuthenticationError AuthenticationError Class Beta Error for issues with authentication. Extends ResponseError Methods Name Description constructor(errorNumber: number, message?: string, getMetaData?: GetMetaDataFunction): AuthenticationError Inherited methods Name Inherited from Description _initName(): string Protected ResponseError This function returns the name of each error status. getMetaData(): any ResponseError Return the meta data associated with this BentleyError. Inherited properties Name Type Inherited from Description _data Protected undefined | any ResponseError description undefined | string ResponseError errorNumber number ResponseError hasMetaData Accessor ReadOnly boolean ResponseError Returns true if this BentleyError includes (optional) meta data. status undefined | number ResponseError Defined in clients/itwin/src/Client.ts Line 185 Last Updated: 29 November, 2022