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See attachment. Maybe "Please wait..." problem?
Created attachment 28011 [details] ArrayStoreException
*** Issue 71151 has been marked as a duplicate of this issue. ***
I successfully reproduced this. It's a problem when one somehow selects "Please Wait..." item.
Fixed. ui/customizer/AddModulePanel.java; 1.33 -> 1.34;
*** Issue 70813 has been marked as a duplicate of this issue. ***
Marking this issue as VERIFIED since the issue reporter == issue owner.
Just improving summary.