I wanted to create a list which can then be called up with a button. The list contains all agents (packages) which which are created by the source.
I can not get rid of the error message.
I checked that the variable packageList is public and I have tried to correct Chatgpt's suggestions for improvement.
As I understand you are already in the main agent environment. So you do not need to call main here. Just change the code to :
packageList.add(agent);