When I click on any button it should display the next Jpanel but doesn't.
I don't see any button.addActionListener(...)
statements.
Read the section from the Swing tutorial on How to Write an Action Listener for more information.
Edit:
It looks like the card you are trying to show doesn't exist. The card name is wrong. That is why many people use static final constants so you don't make a typing error:
cardGUI.add(issueList(), "issueList");
...
cards.show(cardGUI, "IssueList");