License key problem

Hi list,

I have an app deployed as WAR in a WebSphere enviroment. It runs Ok. 
But times to times I get the error

Cannot
be initialized.: <Application> failed instantiation. Exception thrown :
com.webobjects.foundation.NSForwardException
[java.lang.IllegalStateException] <WOApplication> The License key
LICENSE NUMBER is invalid.: <WOApplication>: Cannot
be initialized.: <WOApplication> The License key
LICENSE NUMBER is invalid.: <WOApplication>: Cannot
be initialized.


I have two apps in this environment I I use two different license keys. 
But sometimes when deploying  new version of one of the apps I get this 
error...

Anybody did pass by this kind of problem? What could be happening? I 
don't know how works the initialization of the license, maybe something 
is being "saved" in System.properties, I don't know...

Thank you very much for any help.

Nilton