Sorry more information is needed, you have incomplete labels on the processor and signal lines going to?? such as VREFH0. Your divider does not show. What is powering the Arduino? Aref would normally be powered by the processor VCC.
Sorry more information is needed, you have incomplete labels on the processor and signal lines going to?? such as VREFH0. Your divider does not show. What is powering the Arduino? Aref would normally be powered by the processor VCC.