Saved my life

I opened my computer and brought up Appocalypse. I got a notification saying that my startup disk was almost full and pressed enter to get rid of it but instead it added spaces into Appocalypse. I clicked to close the notification and it closed so I undid everything I accidentally did to Appocalypse. I went to save it and it told me the document was locked. I couldn't find a way to unlock it and then I tried saving again and it said Not Saved. I exported it as a Pages '09 document and then reopened it and upgraded it to the new Pages and now I can edit it again! YAY!