Help with my EDGE

when i try to open edge on My Computer, it's said that i need to format it first to open it. Why is this?

Your MicroSD may have been corrupted. It happens occasionally.If possible try a different adapter, or a different computer. If that doesn't work you may have to format your MicroSD. Hopefully you can backup your files, or have an existing backup.

oh man, i dont have a backup files.
darn