Error "Could not find the main class"

[Sigride UNG]

I am new to Pivot so I followed this tutorial:  
http://blogs.locusta.gr/argy/2011/09/setup-an-apache-pivot-project-in-eclipse/

It works well on one computer but not the other (different version of  
Eclipse). I attached the error message.

And in the console, it says:
Exception in thread "Main Thread" java.lang.ExceptionInInitializerError
Caused by: java.lang.NumberFormatException: For input string: "R28"
        at  
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
        at java.lang.Integer.parseInt(Integer.java:449)
        at java.lang.Byte.parseByte(Byte.java:151)
        at java.lang.Byte.parseByte(Byte.java:108)
        at org.apache.pivot.util.Version.decode(Version.java:147)
        at  
org.apache.pivot.wtk.ApplicationContext.<clinit>(ApplicationContext.java:1598)

Any idea where that might come from?


Cordialement,
--
Sigride UNG
Consultante IT
PrimaFrance



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