espcomm error

Hello Guys..I am working on ESP01 wifi project with Arduino UNO board and Arduino IDE 1.6.11...Ive also added the ESP8266 Generic Board to it..But when i tried to add ESP8266.h file or run the Blink file it gives me error like

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

Anyone knows how to solve this error?

See this:
https://arduino-esp8266.readthedocs.io/en/2.5.0/faq/a01-espcomm_sync-failed.html