If you use SVN to commit your work and get the error “is scheduled for addition, but is missing” when committing to the repository, then problem is that the file is scheduled for the add operation but somehow it has been deleted and SVN couldn’t send it to the repository because the file no longer exist.
To make the commit works, all you need to do is undo the add operation
svn revert myfile
Hope this helps!
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In truth, at first i did understand it. But after re-reading I think i understand