This is vital point which can be consider as workaround:
v Go to the document library in which project files resides
v Hover your mouse to any project file and select 'edit in Microsoft Office Project'
v It will give you a pop up by selecting the 'SharePoint drafts' option
v Click ok / you can do a check out also by selecting the 'SharePoint draft' option
v Now the document is in check out condition so go to the SharePoint drafts location on your machine (Location: \My Documents\SharePoint drafts)
v Open the document by means of draft location, do the changes and save it.
v Go back to the SharePoint site and check in the document.
v Changes will be successfully saved without any problems
Try to install this app
Recovery Toolbox for Project
http://www.project.recoverytoolbox.com/
Here's one thread like yours. It could be useful for your, read
http://www.filerepairforum.com/forum/microsoft/microsoft-aa/project/625-project-error-"an-import-error-occurred"
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