MKS-Robin-E3P
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Serial port issue
In file included from Marlin\src\HAL\STM32F1../../inc/MarlinConfig.h:49:0, from Marlin\src\HAL\STM32F1\HAL.cpp:30: Marlin\src\HAL\STM32F1../../inc/SanityCheck.h:2456:6: error: #error "SERIAL_PORT is set to -1, but the MOTHERBOARD has no native USB support. Set SERIAL_PORT to a valid value for your board." #error "SERIAL_PORT is set to -1, but the MOTHERBOARD has no native USB support. Set SERIAL_PORT to a valid value for your board."
You need set it to 3