I re-annotated for many times I drew the footprint for many times but it didn't fixed.Did you re-annotate your schematic since the last time you updated the PCB? Or did you swap out your diode part for a different one that perhaps doesn't have a footprint, or has the wrong footprint? It's complaining about the PCB side of things.
Thanks a lot for your help. I checked conenctions they are OK now. I want to make new PCB IO card. It will has 4 input and 4 output. I want to do it with STM32F4.How can I get the reference schematic for STM32F4?Be sure you look closely and run a DRC. If altium thinks something is wrong, your PCB could very well come out with unconnected pins.
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