Error: "The operation can’t be completed because one or more required items can’t be found. (Error code -43)"

A simple shut down, then start, of OS X should automatically remove debris from

/Volumes

If you like: disconnect/eject any removable media before the start.

Or simply leave the media in place, and restart.

There may be other approaches to dealing with volume debris whilst the OS is running but in my experience, it's often better to restart.

Also recommended

Error -43 may truly indicate a file system inconsistency, so use Recovery OS Disk Utility to verify affected file systems.

You can search Force Quit & submit it. Then choose Finder and Relauch it. Finally move to trash item 's icon which you want remove

I had previously gotten the Error 43 on my Mac. So Here's the fix: Error Code 43 Mac.

To fix, what you need to do is basically two steps

1. Reset the PRAM. From a powered off state, hold ⌘ Cmd ⌥ Option P R until you hear the startup chimes 3 times, then release and allow your system to boot normally.

2. (Optional) Delete the locked files. In Terminal, execute the following command: chflags -R nouchg. Then open your Trash, select all the item (⌘ Cmd A), drag everything to the Terminal window, then press Return ⏎. Empty your Trash

If you follow these steps, it should solve the problem.