I had the same problem on upgrade from v201209 to v201306. Fixed it by
adding a key to the AdWordsApi section of my app.config to explicitly
utilize ClientLogin authentication.
<AdWordsApi>
<add key="AuthorizationMethod" value="ClientLogin" />
</AdWordsApi>
On Wednesday, July 24, 2013 5:54:46 AM UTC-4, Atul wrote:
>
> I am getting an error of OAuth 2.0 authorization, while upgrading to newer
> version (i.e. v201306) of AdWords API. Previously, I was using the v201209
> version of API and everything was working fine, but on July 22 v201209 was
> discontinued. So, I was upgrading to the newer version, but it is giving me
> error. With v201209, I was not using any type of authorization, it was
> simple Client Login, and I want to implement same thing with v201306, but
> it is not working and needed OAuth 2.0 to implement. I didn't make any
> changes in my existing application, just replaced the reference of older
> version dll with newer dll. After changing the references, I am getting
> this error:
>
>
> Value cannot be null.
> Parameter name: Looks like your application is not configured to use
> OAuth2 properly. Required OAuth2 parameter RefreshToken is missing. You may
> run Common\\Utils\\OAuth2TokenGenerator.cs to generate a default OAuth2
> configuration.
>
> Please help me in resolving this issue.
>
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