An error occured when loading a project 
Autor: Brian LaCount
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An error occured while loading a project. [There is error in XML document (0,0).]
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Brian, please start WX5, select your ploject and click backup. If there is a backup select & redo.
Backups are only created if you upload your site to the web via the built in ftp.
If none that exist will fix the problem, there is a possibility that you could rename metadatabu.xml to metadate.xml and then retry backup/redo
If all else fails and there are no backups then sadly if you do not have an iwzip (step 5 export, export project) your project is probably lost.
For future reference:
PLEASE make frequent use of step5 export / export project!