Erro no Ireports + Jasper

To tentando usar o Jasper.0.6.1 + IReports.0.4.0, fiz a minha classe baseada no tutorial do guj, ms na hora de compilar ta dando este erro

[code]RelatorioVendas.java:2: cannot access jasper.net.sf.jasperreports.engine.JasperManager
bad class file: C:\j2sdk1.4.0lib\jasper\net\sf\jasperreports\engine\JasperManager.class

class file contains wrong class: net.sf.jasperreports.engine.JasperManager
Please remove or make sure it appears in the correct subdirectory of the classpath.

import jasper.net.sf.jasperreports.engine.JasperManager;
^
1 error[/code]

Nao deixa eu acessar nenhuma classe, eu coloquei a pasta do jasper, dentro do j2sdk\lib

os imports sao estes, naum deixa acessar nenhuma classe destas

import jasper.net.sf.jasperreports.engine.JasperManager; import jasper.net.sf.jasperreports.engine.JasperPrint; import jasper.net.sf.jasperreports.engine.JasperReport; import jasper.net.sf.jasperreports.engine.design.JasperDesign; import jasper.net.sf.jasperreports.view.JasperViewer; import java.sql.*; import java.util.*;

E ae coloca os jar do jasperreport dentro de;

C:\j2sdk_1.5\lib
C:\j2sdk_1.5\jre\lib\ext
C:\Arquivos de programas\Java\jre1.5.0\lib\ext //caso tenha
e se tiver usando o NetBeans-3.6 coloca dentro da:
C:\Arquivos de programas\NetBeans3.6\lib\ext

e sua vaiavel de Ambientes tem q tar blz tb:

ANT_HOME = C:\Ant
JAVA_HOME = C:\j2sdk_1.5
CLASSPATH = .;%JAVA_HOME%
PATH = %JAVA_HOME%\bin;%ANT_HOME%\bin;

Da uma conferida ae dpois resposnde no forum