Why is it throwing an error in Appium?

Question

Java

Hey!
I'm at about zero programming level, but I need to implement certain routines through Appium. Found a course on YT, put Appium + Eclipse. I wrote the code strictly as a person on whose guides I tried, I just used my addon. Throws the following error when executing the code:
Verifies the given class.
Usage: CheckClassAdapter
The code should open the app, the phone is properly connected and displayed in the adv device.