espcomm_sync failed

Hi,

I'm having a problem when run esp8266 in ide.

warning: espcomm_sync failed
error: espcomm_open failed
error: espcomm_upload_mem failed

i tried to find solution but still cannot be solved. Anyone can help me to continue my project

Which ESP (there are quite a few to choose from)
Which OS (there are a few to choose from)

Need more details.

espcomm errors are usually quite easy to fix as the error is what it says.
If your ESP requires a programmer (some do) then make sure RX goes to TX and vice versa.

Bob.