How to perform Database Testing using Katalon Studio

This is a companion discussion topic for the original entry at

Facing issue while using (

Error: 2019-04-03 11:16:26.421 ERROR c.k.katalon.core.main.TestCaseExecutor - :x: Test Cases/dbz FAILED.
groovy.lang.MissingMethodException: No signature of method: is applicable for argument types: () values: []
Possible solutions: wait(), wait(long), getAt(java.lang.String), inject(groovy.lang.Closure), wait(long, int), inject(java.lang.Object, groovy.lang.Closure)

Can you show me how to connect mysql via SSH?

You have to use your custom keyword properly.
How to use a custom keyword from other custom keywords and step definition classes