title: Annotation of PDF files with Ghostscript on Windows
body: <p>I try to annotate <em>PDF-files with Ghostscript on Windows</em>.</p>
  
  <p>It works, but sometimes it returns error messages and the application of an annotation fails.</p>
  
  <p>Can anyone tell what this error message actually means?</p>
  
  <p>Here is a screenshot of the error message:</p>
  
  <p><img src="https://i.stack.imgur.com/p3CzF.png"></p>
  
  <p>The command I used in this case:</p>
  
  <pre><code>"C:\Program Files (x86)\gs\gs9.10\bin\gswin32.exe" -o ./work/result/2530
  902.pdf  -sDEVICE=pdfwrite -dPDFSETTINGS=/prepress  ./work/result/2530902_b.pdf
  ./ann/2530902.txt
  </code></pre>