It tells you meaning of the error message already. The identifier CONFIG_BLINK_GPIO is undefined. As can be seen in the platformio.ini for the example
You need to define what pin to blink there.
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Per the comment right above the define, it is telling you what you need to do… either use menuconfig, which will somehow create that CONFIG_BLINK_GPIO or, replace it (CONFIG_BLINK_GPIO) with the pin number for the pin the LED is on.
In your earlier post, you had the -D CONFIG_BLINK_GPIO=2 build_flag defined, so where has that gone?
I know that i define somewhere but i forgot. at that time there was another error.
actually I am new for this IDE and C.
In assembly It was very simple, all files i create manually.
You seem to have changed line 18 of blink.c compared to what it was originally. Revert it back to:
#define BLINK_GPIO CONFIG_BLINK_GPIO
Now compiled and uploaded successfully, but I have unbranded ESP32 module. there is only one LED on module. So I check with multimeter, I shows voltage changes on G2 Pin.
Connected LED. It works.
Thanks to all