Error pin not driven error : Use of flags

[SembazuruCDE]

With the lack of information you provide, all I can do is give you a general rule that I use:

• Study the schematic and decide where each of the power (and ground) nets originate. That can be at a battery, a connector, the output of a power regulation circuit, the output of a power filtering circuit, the output of a power isolation circuit, etc.) The PWR-FLAG symbol should go right where the power net originates.

Also refer (if you haven’t already) to these two posts (links also in the FAQ Index):
https://forum.kicad.info/t/understanding-power-port-components/8945/3

ErrType(3): Pin connected to some others pins but no pin to drive it

Additional reading about pin types in general: Electrical type of schematic symbol pins (KiCad 4 and KiCad 5) A good explanation about power symbols can be found in this stackexchange answer by @Seth_h KiCad does check if every component is connected to supply lines (*1) as a missing supply is a common mistake to make. Getting the error “ErrType(3): Pin connected to some others pins but no pin to drive it” means that KiCad thinks that some supply pin is not properly connected. Either because …