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    <p>This is a common issue with the <code>tm</code> package (<a href="https://stat.ethz.ch/pipermail/r-help/2011-February/268398.html" rel="nofollow">1</a>, <a href="http://www.mail-archive.com/r-help@r-project.org/msg82509.html" rel="nofollow">2</a>, <a href="http://comments.gmane.org/gmane.comp.lang.r.general/229909" rel="nofollow">3</a>).</p> <p>One non-<code>R</code> way to fix it is to use a text editor to find and replace all the fancy characters (ie. those with diacritics) in your text before loading it into <code>R</code> (or use <code>gsub</code> in <code>R</code>). For example you'd search and replace all instances of the O-umlaut in Öl-Teppich. <a href="http://comments.gmane.org/gmane.comp.lang.r.general/229909" rel="nofollow">Others</a> have had success with this (I have too), but if you have thousands of individual text files obviously this is no good.</p> <p>For an <code>R</code> solution, I found that using <code>VectorSource</code> instead of <code>DirSource</code> seems to solve the problem:</p> <pre><code># I put your example text in a file and tested it with both ANSI and # UTF-8 encodings, both enabled me to reproduce your problem # tmp &lt;- Corpus(DirSource('C:\\...\\tmp/')) tmp &lt;- tm_map(dataSet, tolower) Error in FUN(X[[1L]], ...) : invalid input 'RT @noXforU Erneut riesiger (Alt-)Öl–teppich im Golf von Mexiko (#pics vom Freitag) http://bit.ly/bw1hvU http://bit.ly/9R7JCf #oilspill #bp' in 'utf8towcs' # quite similar error to what you got, both from ANSI and UTF-8 encodings # # Now try VectorSource instead of DirSource tmp &lt;- readLines('C:\\...\\tmp.txt') tmp [1] "RT @noXforU Erneut riesiger (Alt-)Öl–teppich im Golf von Mexiko (#pics vom Freitag) http://bit.ly/bw1hvU http://bit.ly/9R7JCf #oilspill #bp" # looks ok so far tmp &lt;- Corpus(VectorSource(tmp)) tmp &lt;- tm_map(tmp, tolower) tmp[[1]] rt @noxforu erneut riesiger (alt-)öl–teppich im golf von mexiko (#pics vom freitag) http://bit.ly/bw1hvu http://bit.ly/9r7jcf #oilspill #bp # seems like it's worked just fine. It worked for best for ANSI encoding. # There was no error with UTF-8 encoding, but the Ö was returned # as ã– which is not good </code></pre> <p>But this seems like a bit of a lucky coincidence. There must be a more direct way about it. Do let us know what works for you!</p>
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    1. COThanks for your reply Ben! For some reason, that same line of code that failed for me works now. I don't know if this is another lucky coincidence :) I didn't change anything, just rerun it and this time it works without any hiccups.
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    2. COGlad to hear you got it working!
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