title: IOException: 'Invalid header field; when creating .jar file with manifest
body: <p>When I type jar cvfm file_name.jar manifest.txt *.class in command prompt I get this error:</p>
  
  <pre><code>java.io.IOException: invalid header field
      at java.util.jar.Attributes.read(Attributes.java:410)
      at java.util.jar.Manifest.read(Manifest.java:199)
      at java.util.jar.Manifest.&lt;init&gt;(Manifest.java:69)
      at sun.tools.jar.Main.run(Main.java:172)
      at sun.tools.jar.Main.main(Main.java:1177)
  </code></pre>
  
  <p>I've never gotten this error before and I can't find anything on it, what does it mean?</p>