Error in respose while using soapclient to check mydomain availability

Error in respose while using soapclient to check mydomain availability

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I am getting following resut when putting _getLastRequest(). stdClass
Object ( [CheckDomainAvailabilityResult] => stdClass Object ( [ResultCode]
=> 201 [ResultMsg] => Authentication Failed: Invalid Authentication
Parameters [TxID] => b06f30a0-3e46-442d-94de-42b6e135f4ab
[AvailabilityStatus] => 3 [LaunchPhase] => GA [DropDate] =>
[BackOrderAvailable] => )
) How canI get rid of the error [AvailabilityStatusDescr] => ErrorOccurred