Problem with crontab -e

Blynk Servers
13

I think you use the wrong command in /etc/rc.local

First, where do you put your server-0.41.11-java8.jar ?
From your error, your command in /etc/rc.local is

java -jar /home/pi/server-0.41.11-java8.jar -dataFolder /home/pi/Blynk &

this requires that your server-0.41.11-java8.jar be placed in /home/pi

But I think you put it in /home/pi/Blynk, and the command to put in /etc/rc.local must be

java -jar /home/pi/Blynk/server-0.41.11-java8.jar -dataFolder /home/pi/Blynk &

You have to test in a terminal first to see if the command is actually working before putting it in /etc/rc.local

Find out where server-0.41.11-java8.jar is by

$ls -la /home/pi/server-0.41.11-java8.jar
$ls -la /home/pi/Blynk/server-0.41.11-java8.jar
# comment, don't run. Search from /home/pi
$sudo find /home/pi -name server-0.41.11-java8.jar -print