Running a Scripted Pipeline in IntelliJ

Hi, I’m a Jenkins noob and I’ve been attempting to use IntelliJ to develop scripted pipelines. I’ve been trying to follow numerous guides online, and I can’t seem to resolve this error when I try to run the pipeline. The goal of using an IDE was to have a code autocompletion feature which I have successfully achieved, however I want to run the pipeline in order to find errors and debug.;