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== Sweave.sty not found ==
The likely reason that this error is triggered is due to the texmf folder not being properly mapped to Miktex's root directory. Since Sweave.sty is positioned in a sub directory of texmf, Miktex never finds it.

Sweave.sty comes standard with current R downloads.

To properly map the texmf directory to Miktex's root directory, follow these instructions carefully.

- Locate the texmf directory inside the share folder in R. For me, the path was C:\Program Files\R\R-3.0.2\share\texmf but this can change from user to user
- Launch Miktex's Options via the start menu or by locating this exectuable C:\Program Files (x86)\MiKTeX 2.9\miktex\bin\mo_admin.exe. You can also follow these instructions
- Click on the "Roots" tab and click "Add"
- Map the folder path to texmf that you located earlier.
- If you receive an error about the file being in use, make sure to close out of any open session of TeXworks.
- Click "Ok" and you're set to go.