It says something is missing and to look at it in XML. I really don't wanna mess up the file, please send help.
Backup your .capx file first, rename it to .zip, unzip to a folder and try fixing the problem by editing xml and caproj files manually in a text editor like Notepad++
Since you didn't post the error message and didn't share your project file, this is the only help I can offer.
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I can post the file, if you knew how. How do I do that, anyway?
Sorry, I don't usually use these forums.
ScreenShot of error:
Try unzipping the .capx file and see if the folder Textures contains the file "SpriteFont.png". If not, create a file with this name and place it into this folder. Try opening this project (.caproj file) in Construct 2 after that.
If this doesn't help, please share your capx file. Upload it to dropbox or a similar service and post the link here.