problems with the build.xml

well, i don´t understand this problem because i defined the attribute src.dir 开发者_如何学编程and when i compiled the project,show me this message.

C:\Archivos de programa\Apache Software Foundation\Tomcat 5.5\webapps\branch_try_htmlModulo2\build.xml:71: Compile failed; see the compiler error output for details.

somebody help me please, i need to fix this error

check it, http://www.mediafire.com/imageview.php?quickkey=lppl5lbscbas4qe&thumb=4

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It looks like a standard compile failure rather than anything specifically wrong with the build.xml.

Your class ProductDAO references a package (flex.messaging.io) that either does not exist or that is not available on the classpath.

Check to see whether the appropriate JAR file is included by master-classpath.