Plugn Prevents Adding Pages in Menu

For some strange reason your plugin prevented me from adding one page in the WordPress menu. Keeping giving me the spinning icon that is used to know the task is happening but the icon keeps running and the menu item not being added.

Thought it was the page, so I rebuilt it but when I went into to add the page to menu it didn’t take either. So I went through the troubleshooting steps and Pop up Maker is causing the problem.