Cannot send e-mail via ant

[Denis Bessmertnyj]

Hi, All. 

I try to send e-mail via ant.

Here is my code
<mail mailhost="..." 
             mailport="..." 
             from="..." 
             tolist="..." 
             subject="..."
             messagefile="..."
             encoding="mime" 
             messagemimetype="text/html" 
             charset="Windows-1251">
            
           <fileset dir="...">
               <include name="**/*.xml"/>
           </fileset>
       </mail>
And I receive 

BUILD FAILED
java.lang.NoSuchFieldError: headers


What is wrong?

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