error while uploding and the BLYNK app shows device offline

[pricne]

Hii
I have an nodemcu that has ESP12N on board i have connected that to my wifi using wifi.sta.config("myssid","mypassword") on ESPLORER and that works fine and i get my ip using wifi.sta.getip().
Then i uploaded a blink led program for pin D0 and that works fine.
next i thought of doing the same using my phone for which i used your library and did the appropriate changes saved it uploaded the init.lua to my nodemcu to which i got a reply 'already connected '
but the Blynk shows 'device is offline'.
BELOW ARE THE LAST 4 LINES ON THE TERMINAL:

file.close();
dofile("init.lua");
Starting blynk example
cannot open blynk.lua

I don't have any experience working the lua.
If possible can u list down a procedure to get it working.
Thanks for the library