Since you're uploading code in Arduino Uno. I suggest select in Arduino IDE (top menu) *Tools --> Bo
Since you're uploading code in Arduino Uno. I suggest select in Arduino IDE (top menu) Tools --> Board --> Arduino AVR Boards--> Arduino Uno and then compile and check if issue persists. The job of ESP8266 is to receive AT commands from aruduino and provide Wifi connectivity so that hw will connect to Blynk server. Please share a picture of your hardware setup so we'll get exact idea about how you've connected ESP8266 and Arduino Uno.
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