Build Failure Error in Jenkins Pipeline

In question 8 of Jenkins Lab 2, I made all the changes according to the instructions given. However, I am still receiving a build failed message. After checking the console output, I noticed that the error in my Jenkins pipeline occurs where the sleep command receives null instead of a valid time interval

https://learn.kodekloud.com/user/courses/jenkins-for-beginners/module/cd53a160-c852-4d65-b718-31b284cb48da/lesson/4860d04d-a61e-4d6c-884c-fc7f87a75e63

If you don’t select one of the options when launching the build and no default is set for the parameter, then its value will be null

I tried the lab; I’m not sure where you went wrong, since I did not get that error (although I did get the error “No suitable check publisher”, whatever that means.).

Thanks for your help

Thanks for your help!