Lucene 1.9.1 Fields()

[Charles.Sanders]

I'm having a little trouble converting my code from Lucene 1.4.2 to
Lucene 1.9.1.  The following code is throwing exceptions, but I'm not
sure why.
 
Field myfield = new Field("docid", "5", Field.Store.YES,
Field.Index.UN_TOKENIZED);
 
Any help greatly appreciated.
 
The exception is:
org.apache.lucene.document.Field.<init>(Ljava/lang/String;Ljava/lang/Str
ing;Lorg/apache/lucene/document/Field$Store;Lorg/apache/lucene/document/
Field$Index;)V java.lang.NoSuchMethodError 
 
Thanks,
Charles