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VirtualBox Error: The Selected Machine is INACCESSIBLE

I tried to download VirtualBox for the rails development course, and uninstalled it the first time. I tried to reinstall it and when I did the following error appeared.

The selected virtual machine is Inaccessible. Please inspect the error message shown below and press the Refresh if you want to repeat the accessibility check:

Runtime error opening '/Users/Home/VirtualBox VMs/railsapi_default_1454901717056_42656/railsapi_default_1454901717056_42656.vbox' for reading: -102(File not found.). /Users/vbox/tinderbox/5.0-mac-rel/src/VBox/Main/src-server/MachineImpl.cpp[740] (nsresult Machine::i_registeredInit()). Result Code: NS_ERROR_FAILURE (0x80004005) Component: MachineWrap Interface: IMachine {f30138d4-e5ea-4b3a-8858-a059de4c93fd}

Any Idea of why, and/or how to fix the problem?