You have tried to convert the same file, after you have just converted that file.
If you choose another file to convert, then the file that gave the warning message again, it will convert OK.
<File Location> Filename1.studio <<Convert to SVG>> OK
<File Location> Filename1.studio <<Convert to SVG>> The same file has been selected twice in succession...
<File Location> Filename2.studio <<Convert to SVG>> OK
<File Location> Filename1.studio <<Convert to SVG>> OK
Ian