VERR_ALREADY_EXISTS Failed to register the virtual machine machine-name. Could not create the settings file ‘C:\Users\username\VirtualBox VMs\archer\archer.vbox’ (VERR_ALREADY_EXISTS).

<tl;dr> To fix the Eclipse “No Java virtual machine was found” error, simply edit the eclipse-inst.ini file and add the -vm flag, which points it to the java utility in the JDK bin directory: ...

VirtualBox sometimes fails to open guest session and encounters VERR_NOT_FOUND VirtualBox error, we need to add to the problematic virtual machine. Follow the steps mentioned below to do the same.

The Java virtual machine manages application memory and provides a portable execution environment for Java-based applications.