'Converting .ova file to .vdi
I had installed mininet-wifi on virtual box via .ova file. Its operating system was lubuntu. As a result of moving and deleting, the .vdi file in the mininet-wifi folder in the virtual box was deleted or lost. But the .vbox file still exists. When I try to open from virtual machine "VD: error VERR_FILE_NOT_FOUND opening image file 'C:\Users\nilya\VirtualBox VMs\mn-wifi\mn-wifi-vm-disk002.vdi' (VERR_FILE_NOT_FOUND)." I get an error. I tried to replace the .vdi file so as not to reinstall it. I downloaded mininet-wifi .ova again. I opened the .ova file via winzip. Even though it had exactly the .vdi file I was looking for, its icon was gone, as if it was dead , it didn't work.The .vdi file should have been an orange cube icon.
The virtual machine still won't open. Why ? And what can I do? 
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