Motion Detector issues

First… I already fixed your posts with the formatting that was requested of you, and as per the Welcome Topic…

Second… as for your errors… are you sure you have installed the Blynk Libraries properly?

https://intercom.help/blynk/getting-started-library-auth-token-code-examples/getting-started

Finaly… do NOT try to run this function call directly from the void loop() which runs hundreds/thousands of times a second… learn about BlynkTimer and use it to call the getPirValue() function…

http://help.blynk.cc/getting-started-library-auth-token-code-examples/blynk-basics/how-to-display-any-sensor-data-in-blynk-app