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

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