General ⇒ why“LaTeX Error: File `setspace.sty' not found“”？
why“LaTeX Error: File `setspace.sty' not found“”？
why“LaTeX Error: File `setspace.sty' not found“？
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Re: why“LaTeX Error: File `setspace.sty' not found“”？
Because you don't have the setspace package installed, perhaps?
If you want more help in fixing the problem, let us know what LaTeX distribution you're using (e.g., MikTeX, TeXlive, etc.), and whether or not you've used setspace before.
If you want more help in fixing the problem, let us know what LaTeX distribution you're using (e.g., MikTeX, TeXlive, etc.), and whether or not you've used setspace before.