pb after observeInBackgroud

Hi

Win10 Pro last release, Sikuli ide 2.0.4

this is the script...
ErrComm Exists but sikuli don(t see it
it means that the script pass after print("1")
TeamV doesn't exist, it's ok, but...
it doesn't click on ErrComm... and don't print 2
it's happend in BueStacks...

def changeXX(event):
    #RegEventXX.stopObserver
   # while not exists(ErrComm): print("raté")
    print("1")
    while exists(okTeamV):
        click(okTeamV)
    while exists(ErrComm):
        click(ErrComm)
    while exists(Debloc): click(DeblocOk)
    if not exists(ErrComm):
        print("2")

  # RegEventXX.observeInBackground(FOREVER)

# imprévu
RegEventXX.onChange(5, changeXX)
RegEventXX.observeInBackground(FOREVER)
# fin imprévu