[Google services Android] Getting Player ranking or/and Player scoring


I use Unity 2017.3.0f3 with the lasted play-games-plugin-for-unity in my project.
When i want to get the player ranking or the player scoring, it gave me a log in my Android device.
I call this function in my Update().
Google play services is working and i already use to upload my score & unlock achievement.

here’s my function: https://pastebin.com/i6eCrabK

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My Game is published on the store and even if i use the example for LoadScores(), it have the same bug.
Anyone have a solution to this ?