Hi @amanda and @amotor . You are right. I figured that out the day after I placed this post. It was weird because up until now the code editor shows an error on my custom fields (even though they are saved when excecuting the code). It is probably just a bug, but it would be nice to check that out because I lost many hours trying to understand the error to finally realize I needed to ignore it.
Thanks for replying! I will mark your replies as accepted answers.