I am getting this error and don’t know how to fix it, does anyone have any suggestions? The error is in the very top it has a small red arrow pointing to it.
Probably the VOUT pin of U4 is not of electrical type Power Output.
Unrelated, but you have a short over C14
I think you just have to add a PWR_FLAG to GND, the same way you added it to +3.6V near J3.
I see you already have some PWR_FLAG symbols sprinkled around 
No. U4 is for the +3V3 rail and that one seems to be OK. KiCad is not even complaining about the +1V1 power rails, so I guess that U1 pin 24 is also defined as a power output.
Mr Rodriquez did not post the full DRC violation text (below the main violation, there is a message with the net name and such), but the ERC arrow is on the GND symbol. The GND net usually also needs an PWR_FLAG. Note that KiCad flags it as a violation when more then one power outputs are on a net, and because of this the GND pin of voltage regulators is never defined as a power output pin, because then you could not create power rails with different output voltages.
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