[magnolia-user] get Vaadin error after installing MAgnolia 5.3.12

[Xena (via Magnolia Forums)]

hi all

After i installed Magnolia 5.3.12 version
Logging in to Admin central I get this error

Jän 05, 2016 9:25:50 AM com.vaadin.server.DefaultErrorHandler doDefault
SEVERE: 
java.lang.VerifyError: Bad type on operand stack
Exception Details:
  Location:
    com/vaadin/server/Page.getJavaScript()Lcom/vaadin/ui/JavaScript; @26: 
invokevirtual
  Reason:
    Type 'com/vaadin/ui/UI' (current frame, stack[1]) is not assignable to 
'com/vaadin/server/AbstractClientConnector'
  Current Frame:
    bci: @26
    flags: { }
    locals: { 'com/vaadin/server/Page' }
    stack: { 'com/vaadin/ui/JavaScript', 'com/vaadin/ui/UI' }
  Bytecode:
    0000000: 2ab4 0039 c700 192a bb00 3a59 b700 3bb5
    0000010: 0039 2ab4 0039 2ab4 0007 b600 3c2a b400
    0000020: 39b0                                   
  Stackmap Table:
    same_frame(@29)

        at com.vaadin.ui.UI.<init>(UI.java:130)
        at com.vaadin.ui.UI.<init>(UI.java:226)
        at 
info.magnolia.ui.admincentral.AdmincentralUI.<init>(AdmincentralUI.java:74)


Any clue please?

-- 
Context is everything: 
http://forum.magnolia-cms.com/forum/thread.html?threadId=9c0adbe0-6652-4d74-a21b-107162997ed6


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