Banner Not opening the second time on any device

i dont know why but in this apk the first time i open the app it shows the banner ad but then if i open the app again it dosn’t show the banner ad can anyone slove this please😓.
i also followed the admob guide
Drift_Boss.aia (2.2 KB)
@Ajdeveloper @Akash_Kinha @Avinash

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Use BanneradError to know your error.