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whenever i trying save my project this error accour i dont no why and what should i do

whenever i trying save my project this error accour i dont no why and what should i do
when i press ctrl+s or save,
not all files but almost 90%
So you have an already existnfile aneyou press Ctrl+S and then you get thpopup?
Where are those files saved?
If not on your local harddrive, please copy them there. Then try again
Also: please turn off "Save in background" in the Illustrator Preferences > File handling.
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