my ad only can show test ad, so i want to try another method and i saw the admob ad placement, after i plugin the ad placement can't be plug, it always said there have same file. so i unplug the ad placement. after i unplug ad placement, and reimport the admob plugin. now even the test id can't show and said there have error of null reference of my AD. even i try to open a new project and try to show AD and that also said null reference. how can i reverse of fix it. i need help. thank you.
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this is the part which have null reference but it is normal before plugin ad placement
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