Keywords issues in katalon

Hey, guys. I wrote a custom keywords for my testing scripts.

I use this keywords in my testing scripts:

but it will always give me the error when I am running it:
Ask for help which part of the code is wrong? Thanks!

It looks like the system has an issue with the class itself - the Mobile reference is underlined.

Did you forget to import it?

Put your cursor in the verifyAlert file and press Ctrl+Shift+O (that’s not a zero!)