Save your company with a different name

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Hello,

I seem to be having trouble when saving my company. I always click save as & resave over the same file. The last few days after I try to save using the same file name I've been using, I get a message that says "Save your company with a different name".  It seems that the only way I can save the company is to rename the file each time I save. Has anyone experienced this or know how to fix it?

Thanks