What supposed to be the problem here, I’m trying to make a sensor that can measure distance and can be seen using the blynk app.
Read this link…
Scenario 3 applies to your code.
In future, please DO NOT post screenshots of your error messages or code. Instead, create a “Need help with my project” category topic and follow the instructions about how to post code etc.
Of, better still, do a quick search beforehand and find the answer to your problem before creating a post.
Pete.