Error: Could not find or load main class com.backendless.coderunner.CodeRunnerLoader

am trying to follow this tutorial and i’m on step 8 (Run the CodeRunner script with the secret key) but am getting this error don’t know what am doing wrong ? anyone can guide me ? my error-
/Desktop/BackendTest/bin/coderunner.sh 18DFF1BA-C31F-8890-FFC1-3BCB25519C00
Listening for transport dt_socket at address: 5005
Error: Could not find or load main class com.backendless.coderunner.CodeRunnerLoader

What do you get when you run:?

java -version

Also, did you download coderunner as a part of code generated on the business logic screen?

Regards,
Mark

well i checked my java version by

    Click on Apple icon on upper left of screen. Go to System Preferences. Click on the Java icon to access the Java Control Panel. and its version 8
and by saying "did you download coderunner as a part of code generated on the business logic screen?" you are pointing to this file ?