Smart GWT upgradation

[AmitS]

Hi Friends,I am using smart GWT 2.2, and want to upgrade it to 2.4.for that what i did is ,I downloaded the latest 2.4 version and replace the old jar (specifically two jar :smartgwt-skins.jar and smartgwt.jar).After this i download the WindowBuilder's Plugin for my Helios eclipse.now when i am trying to open my code with that WindowBuilder ,but it showing me some internal error.


WindowBuilder encountered unexpected internal error.

This could be caused by a WindowBuilder bug or by a misconfiguration issue, conflict, partial update, etc.

Stack trace:
java.lang.NullPointerException
at java.util.zip.ZipFile.getInputStream(ZipFile.java:180)
at java.util.jar.JarFile.getInputStream(JarFile.java:385)
at Com.google.gwt.dev.resource.impl.ZipFileResource.openContents (ZipFileResource.java:90)......................

can u suggest me the possible solution.Thanks in advance
Note:
1. i want to know how to upgrade the smart GWT version to latest one,is it required some code manipulation or simply replacement of jar.please suggest required tutorial or way to do this.

[davidj6]

Note this comment from the FAQ:

"First, make sure you have followed the full install instructions. Do not skip steps, do not assume that just copying .jar files around is sufficient."