The specified child already has a parent

[ppamorim]

The specified child already has a parent. You must call removeView() on the child's parent first.

[shehabic]

This happens when you try to add a custom view, that's already visible/inflated, the work-around is to add it as resource i.e. R.layout.your_custom_layout but I'll add an extra thing to the lib to detach the view from its parent first before attaching to the popup menu

[a-v-ebrahimi]

I am not using custom view and have same problem, seems I should find another drop down menu :(
Your code is not ready for a serious job.

[shehabic]

can you share your setup here please?

[shehabic]

I believe with the new release this issue should be fixed, do you guys have any feedback or still facing this issue ?

[mjtrujill]

Your latest updates have solved my issue. I have this set up in a listview, so i have multiple buttons that can open a popup. The use case that was crashing my app would happen if I opened a popup from one item, then click outside the window or open popup from another item, then tried to open the original popup again. With the update, I have no issues.

[shehabic]

I'm closing this issue, please if anynone's still facing an issue ask for reopening or open a new one with details.