App suddenly fails with OAUTH_TOKEN_INVALID error

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John VV

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Dec 8, 2015, 12:58:13 PM12/8/15
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My app has been untouched and successfully connecting to the AdWords API since v201506.
I am using the php client library and auth.ini for credentials.

Suddenly today the follow error is triggered:
 [soap:Server] [AuthenticationError.OAUTH_TOKEN_INVALID @ ; trigger:'<null>'] ... thrown in ... Google/Api/Ads/Common/Lib/AdsSoapClient.php on line 217

Why is this error occurring?
What do I need to do to get my credentials working again?  
New RefreshToken? How? (it was a while ago that I set it up and I think the process has changed).
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