Authentication error

[The Trumpet]

Hi,

Iam new to Google Adwords. I am getting the following error while i was to send the soap request to Google Adwords in order to retrieve the Get Campaigns from my Account. 

<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"><soap:Header><ResponseHeader xmlns="https://adwords.google.com/api/adwords/cm/v201506"><requestId>00051dbbd7ee41d80abfc14ce402910b</requestId><serviceName>CampaignService</serviceName><methodName>get</methodName><operations>0</operations><responseTime>699</responseTime></ResponseHeader></soap:Header><soap:Body><soap:Fault><faultcode>soap:Server</faultcode><faultstring>[AuthenticationError.OAUTH_TOKEN_HEADER_INVALID @ ; trigger:'&lt;null&gt;']</faultstring><detail><ApiExceptionFault xmlns="https://adwords.google.com/api/adwords/cm/v201506"><message>[AuthenticationError.OAUTH_TOKEN_HEADER_INVALID @ ; trigger:'&lt;null&gt;']</message><ApplicationException.Type>ApiException</ApplicationException.Type><errors xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="AuthenticationError"><fieldPath></fieldPath><trigger>&lt;null&gt;</trigger><errorString>AuthenticationError.OAUTH_TOKEN_HEADER_INVALID</errorString><ApiError.Type>AuthenticationError</ApiError.Type><reason>OAUTH_TOKEN_HEADER_INVALID</reason></errors></ApiExceptionFault></detail></soap:Fault></soap:Body></soap:Envelope>

Thanks

[Umesh Dengale]

Hello,

The above error indicates that the Authorization header in your API call request is malformed. Please check your SOAP request and make sure it is formatted as given in this document.

Thanks,

Umesh, AdWords API Team.