The error occurs because, in your RebuildValidatorSuppressor class, you haven't provided a valid override of isApplicable(Run<?, ?> build) that matches the expected signature. Jenkins expects this method to be overridden.

 public class RebuildValidatorSuppressor extends RebuildValidator {
    
    @Override
    public boolean isApplicable(Run<?, ?> build) {
        // Your custom logic to determine if the rebuild action should be suppressed.
        // Example: Check if the build's project has a specific characteristic.
        
        if (build.getParent() instanceof SomeSpecificProjectType) {
            return false; // Suppress rebuild action for this project type.
        }
        
        return true; // Allow rebuild action otherwise.
    }    @Override
    public boolean isApplicable(AbstractProject<?, ?> project) {
        // Your custom logic for the project-specific applicability.
        return super.isApplicable(project);
    }
}