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If you have copied the command and the message from your original file and log, the reason is simple: The name of the installed package is pdfpages not padfpages . So you should change \usepackage{padfpages} into \usepackage{pdfpages} (or install a package named padfpages , but CTAN does not have ...

I'm using MIktex2.9 and I want to add a separate pdf page to my thesis. I installed the pdfpages package using the Miktex package installer. It installed successfully. I can see the pdfpages.sty in Miktex2.9/tex/latex/pdfpages forlder.
However when I try to use this package using \usepackage ...