There is a change in library version 1.3.0 which no longer tolerates the use of BLYNK_DEVICE_NAME and now requires the new BLYNK_TEMPLATE_NAME to be used. Version 1.2.0 tolerated either.
more info here…
However, this doesn’t appear to be @Hayk’s problem, and once he edits his post to add triple backticks I’ll engage with him to help identify and resolve the issue - which I suspect is a missing quotation mark.
If you’re having a similar issue then I’d suggest taking a close look at your code, and if you can’t fix the issue then start a new topic and post your code and compiler error message (both correctly formatted) and any other relevant information.
Pete.