Problem installing guest additions

[DRIESMUL]

When I try to intall the guest additions, I get the error as shown below.

I looked in the directory, and the correct ISO file is there.

Unable to insert the virtual optical disk C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso into the machine Centos83.

Could not mount the media/drive 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' (VERR_PDM_MEDIA_LOCKED).

Result Code: E_FAIL (0x80004005)
Component: ConsoleWrap
Interface: IConsole {872da645-4a9b-1727-bee2-5585105b9eed}
Callee: IMachine {85632c68-b5bb-4316-a900-5eb28d3413df}


What could be the cause of this.

[scottgus1]

This is a common-happening error. Web-search "VERR_PDM_MEDIA_LOCKED site:forums.virtualbox.org"