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hi everyone, i am trying to do my first datasnap connection between a delphi xe5 datatsnap server and a sms-client. after generating the connection unit with the "DataSnap Smart" proxy generator i am confronted with tow compiling errors and a warning. .warning with uses w3system: no problem easyly solved by using SmartCL.System .2 errors "unknown name" TDBXStreamValue and WideString: TResult_TServerMethods1_AS_Execute = class external ParamReader: TDBXStreamValue; OwnerDataStream: TDBXStreamValue; end; and procedure AS_Execute(ProviderName: WideString; CommandText: WideString; ParamReader: TDBXStreamValue; OwnerDataStream: TDBXStreamValue); please help! cheers, JBS