Cannot upload any sketch

Hello, I'm trying to upload a simple sketch like the following

Code:

void setup() {
    pinMode(13, OUTPUT);
}

void loop(){
    digitalWrite(13, HIGH);
    delay(1000);
    digitalWrite(13, LOW);
    delay(1000);
}

But I'm not able to do it.. using Arduino Web Editor I get a message "Cannot flash sketch!" and using the Arduino IDE from Windows (v1.8) keeps Uploading and then fails with no error.

What I'm doing wrong?

 

What Arduino web editor? I do not think the Udoo Neo is supported by it. Only supported by the preinstalled Arduino IDE on the Neo itself or by an external Arduino IDE installed according the documentation. https://www.udoo.org/docs-neo/Arduino_M4_Processor/Programming_Arduino_M4_from_External_PC.html