Error
Uncaught Exception: 190: Invalid OAuth access token signature.
Solution
It was a dump mistake from my side, i generated access token from facebook api
https://graph.facebook.com/oauth/access_token?
and it seems it returns "access_token=XXXX"
I didn't know that and then i added the returned token as a parameter value in the next API call
$apiURL = "https://graph.facebook.com/YYYY/posts?access_token=$accessToken;
the the URL ended as
https://graph.facebook.com/YYYY/posts?access_token=access_token=XXXX
That was the problem for me
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