error: espcomm_open failed

[ieee488]

i ran an example from the software on my esp8266 nodemcu v1.0 i also installed the drivers and just connected the module to the PC via micro USB cable. i selected the esp8266 for the example. and still getting the same error if anyone knows how to fix this please reply to this comment for the same.
thank you

Not a data micro USB cable; yours just charges.


.

[BOUKHILI]

Hi
i had this proble when i upload the scketch

erreur:
warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed
Une erreur est survenue lors du transfert du croquis

[Tachyon01]

In my case trying again works many times.

Some other times closing the IDE and then opening it again helps.
But I also don't know why this happens.