Moderator: igrr
I just created a user to add:
sometimes simply powering the ESP8266 board before the serial adapter (that is used for programming in arduino environment) will get you rid of this error. My knowledge of ESP is pretty weak, but saw this happen to friends two times already, and thought I will give everyone a hint. Hope it helps.
There were actually three errors in the arduino console, but I can't remember the other ones.
Istvan
I have to thank you a lot! Thanks to everyone! Your comment is one of the clearest I could find about the correct configuration.
Thanks again! =)