Normally, for PHP client library, if the error being generated states that
it cannot find a certain class, then it means that the dependencies are not
fully installed/downloaded. I have also encountered this issue before for
the OAuth2TokenBuilder when I installed the latest PHP client library
locally. What I did to resolve the issue was to install again the client
library using composer as you can see on this guide
to make sure that all dependencies are downloaded.
On your end, if you haven't, can you try to install the client library again
on that guide and let me know if the issue still persists?
AdWords API Team
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