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I'm using LDTP to write a GUI test case script in python. I'm running the script in a virtual machine by nosetests.

And I get block with the error of unable to find window X ,while window X is absolutely displayed on the monitor. This error always occurs after LDTP actions.

Example:

After I open my subscription manager in the virtual machine (rhel6.8) , I could find the subscription manager by calling getwindowlist():

>>> getwindowlist()
['frmTopExpandedEdgePanel', 'frmBottomExpandedEdgePanel', 'frmroot@localhost:~', 'frmx-nautilus-desktop', 'frmSubscriptionManager']

Then I use getobjectlist() to do some action....

>>> getobjectlist('frmSubscriptionManager')
['flr8', 'flr4', 'mnuAbout', 'flr6', 'flr7', 'flr0', 'flr1', 'flr2', 
'flr3', 'ukn2', 'ukn3', 'ukn0', 'ukn1', 'scpn1', 'scpn0', 'scpn3', 'scpn2', 
'lblStatus1', 'lblContract', 'ptl0', 'flr5', 'txtStartEndDateText', 
'tblBundledProductsTable', 'scbr0', 'mnuRedeemSubscription', 
'tchEndDate', 'lblStatus', 'mnuSystem', 'mnuRegister', 'tchStartDate', 
'lblSKU', 'txtSKUText', 'txtProvidingSubscriptionsText', 'tchQuantity', 
'txtSupportTypeText', 'ttblMySubscriptionsView', 'mnuEmpty', 
'txtArchText', 'mnuConfigureProxy', 'txtSupportLevelAndTypeText', 
'mnuHelp', 'mnuOnlineDocumentation', 'lblStart-EndDate', 'mbr0', 
  ......etc]

The window disappeared, even though it was still displayed on my virtual machine's monitor.

>>> getwindowlist()
['frmTopExpandedEdgePanel', 'frmBottomExpandedEdgePanel', 'frmroot@localhost:~', 'frmx-nautilus-desktop']

Why does this error occur, and how should I deal with this situation in an automated test?

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