Fatal error:one of the following jar files is missing from the classpath

Hi everyone!I recently opened a IB demo account and installed their TWS.But when i run their platform an error occurs.
(Fatal error:one of the following jar files is missing from the classpath:
jfreechart-1.0.0.jar
jcommon-1.0.12.jar
Please make sure you run the application from the shortcut that was installed on your desktop or on the start menu when you upgraded.
The applicaton will now terminate.)
So does anyone know of any solution?
Thanks in advance
 
Very briefly, uninstall, reinstall current Java. Reinstall TWS. You should optimize your workstation and datafeeds. Many videos for that.
 
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