i am trying to make a config and i have the following line:

@PreInit
public void PreLoad(FMLPreInitializationEvent event){
	Configuration config = new Configuration(event.getSuggestedConfigurationFile());
        
        config.load();
        
        String CustomRecord1Name = config.getOrCreateProperty("CustomRecord1Name", Configuration.CATEGORY_GENERAL, "nothing").value;
        
        config.save();
}

and eclipse is telling me the method getOrCreateProperty is undefined for the type Configuration.

Because that verbose method names were removed..

All the information you need is inthe config class.