<tag-class>org.eclipse.birt.report.taglib.ViewerTag</tag-class>
<tag-class>org.eclipse.birt.report.taglib.ReportTag</tag-class>
<tag-class>org.eclipse.birt.report.taglib.ParamTag</tag-class>
<tag-class>org.eclipse.birt.report.taglib.ParamValueTag</tag-class>
<tag-class>org.eclipse.birt.report.taglib.RequesterTag</tag-class>
<tag-class>org.eclipse.birt.report.taglib.ParamDefTag</tag-class>

The tag handler class for(org.eclipse.birt.report.taglib.ParamDefTag) was not found on the Java Build Path.

<%@ taglib uri="/birt.tld" prefix="birt" %>

<jsp-config>
    <taglib>
       <taglib-uri>/birt.tld</taglib-uri>
       <taglib-location>/WEB-INF/tlds/birt.tld</taglib-location>
   </taglib>
  </jsp-config>

 put above configuration to web.xml ,try some location