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via Coderanch by Greg Brannon, 1 year ago
adding container's parent to itself The stack trace that caused the error is beneath. I prefer to start at the bottom, looking for references to my code in each line that starts with an 'at'. There will also be references to other code, usually
java.lang.IllegalArgumentException: adding container's parent to itself 
The stack trace that caused the error is beneath.  I prefer to start at the bottom, looking for references to my code in each line that starts with an 'at'.  There will also be references to other code, usually core Java classes and methods, but they can be to any other code imported to make your code complete.
Inverting your stack trace:	at charitypledgeprogram.CharityPledgeProgramGUI.main(CharityPledgeProgramGUI.java:142)