I don’t run ERC so I’m not sure what I write.
Error arrow not exactly points where error is (it is what you probably are missing). If there are 10 pins needing power (power inputs) at the net and there is 0 pins being power output at that net then arrow points at one of those power inputs pins showing you that this net has no power output pin at it.
It is better to get one such error that can be resolved by one PWR_FLAG then to get 10 errors pointing to each power input pin at that net.
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