Error AFTER sending the program

Hello

We are new with Arduino. We like a lot. We have charge oir first programs and everything is ok, but since a minutes ago it show me this error. What can I do? I see in arduino that led flash like the program has arrive.

THANK YOU

El Sketch usa 1186 bytes (3%) del espacio de almacenamiento de programa. El máximo es 32256 bytes.
Las variables Globales usan 9 bytes (0%) de la memoria dinámica, dejando 2039 bytes para las variables locales. El máximo es 2048 bytes.
avrdude: verification error, first mismatch at byte 0x0000
0xff != 0x0c
avrdude: verification error; content mismatch
avrdude: verification error; content mismatch

Do you have an AVR programmer? If so, I suggest reinstalling the bootloader.

I have seen this happen myself, the only solution I have found was to put the bootloader back on.

I use RAW chips with custom boot loaders, so I do not know if that is why I see this from time to time.

Please, Can you tell me how to do that?

RamonRuiz:
Please, Can you tell me how to do that?

In the Arduino IDE under tools, you will see an option to BurnBootLoader.

The easiest way is with an AVR programmer, it is simple, easy to use.

However, if you do not have a AVR programmer there are other ways to do it. You will need to Arduinos.

Here is a link for your reading. https://duino4projects.com/arduino-as-avr-programmer/

wow. Too dificult to me

Any other way to do that?

Thanks