["Please disable all mods in NMM"]

Deleting the whole VirtualInstall folder isn't neccessary.

 

I found that Vortex continued to think I had mods enabled until I went to my VirtualInstall folder and edited the VirtualModConfig.xml file.

 

In the VirtualModConfig.xml file there was an old mod that must be from a previous installation. I deleted this node from the <modList> so that the file showed like this:

<?xml version="1.0" encoding="utf-8"?>
<virtualModActivator fileVersion="0.3.0.0">
  <modList></modList>
</virtualModActivator>

Vortex then was able to continue successfully with the mod import process.