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i have this problem too. I download jbpm5.2 installer and ant install.demo on my win7 or xp

Like mika suggested I changed the umlauts and the special charkters.

either i replace ä to a, ö to o, ü to u, ß to B

or i just delete all ä,ö,ü,ß

i still get the javascript error as same as renez's error as below:

1. Uncaught TypeError: Cannot call method 'split' of undefined
   1. Enumerable.eachprototype-1.5.1.js:449
   2. ORYX.Core.StencilSet.stencilSetsstencilsets.js:61
   3. ORYX.Editor.getStencilSetsmain.js:1204
   4. ORYX.Editor._createCanvasmain.js:643
   5. ORYX.Editor.constructmain.js:125
   6. classDefclazz.js:60
   7. window.onOryxResourcesLoadedORYX.Plugins.UUIDRepositoryDummySave.js:418
   8. initmain.js:44
   9. Object.extend.loadoryx.js:121

finally, i delete designer.war\stencilsets\bpmn2.0jbpm\stencildata\bpmn2.0jbpm.orig ,then it seems work well.

my question is will it cause another problem?