# Client Event Startup Script invokeLater **URL:** \ **Category:** Ignition\ **Tags:** vision\ **Created:** [January 11, 2023, 8:27pm UTC](https://forum.inductiveautomation.com/t/client-event-startup-script-invokelater/68512 "2023-01-11T20:27:19Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![dion.botha](https://avatars.discourse-cdn.com/v4/letter/d/46a35a/32.png) [@dion.botha](https://forum.inductiveautomation.com/u/dion.botha)\ **Post date:** [January 11, 2023, 8:27pm UTC](https://forum.inductiveautomation.com/t/client-event-startup-script-invokelater/68512/1 "2023-01-11T20:27:19Z")
Hi All, I have a project that auto logs into a guest account and a custom login window (Vision) that opens on startup. For reasons I don't want to bore anyone with, I then have the following client event startup script: ```auto user = system.security.getUsername() if user == 'Guest': tagPaths = ["[System]Client/Network/Hostname"] tag = system.tag.readBlocking(tagPaths) if tag[0].value == 'MyPC': success = system.security.switchUser('username', 'password') if success: windowPath = 'User Management/Switch User' def closeWindow(windowPath): import system system.nav.closeWindow(windowPath) system.util.invokeLater(closeWindow(windowPath), 1000) ``` I am trying my hardest not to use sleep (as @pturmel strongly recommended on multiple forum posts) but I am getting this error and the window does not close: ```auto TypeError: 'NoneType' object is not callable at org.python.core.Py.TypeError(Py.java:236) at org.python.core.PyObject. __call__ (PyObject.java:396) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:843) at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:825) at com.inductiveautomation.factorypmi.application.script.builtin.ClientSystemUtilities.lambda$invokeLater$0(ClientSystemUtilities.java:273) at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.desktop/java.awt.EventQueue$4.run(Unknown Source) at java.base/java.security.AccessController.doPrivileged(Native Method) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.desktop/java.awt.EventDispatchThread.run(Unknown Source) Ignition v8.1.21 (b2022092908) Java: Azul Systems, Inc. 11.0.15 ``` ---
**Author:** ![dion.botha](https://avatars.discourse-cdn.com/v4/letter/d/46a35a/32.png) [@dion.botha](https://forum.inductiveautomation.com/u/dion.botha)\ **Post date:** [January 11, 2023, 8:35pm UTC](https://forum.inductiveautomation.com/t/client-event-startup-script-invokelater/68512/2 "2023-01-11T20:35:19Z")
Further info: I only started trying to close the window after a delay after it seemed the last line of the previous version on my script was not doing anything: ```auto user = system.security.getUsername() if user == 'Guest': tagPaths = ["[System]Client/Network/Hostname"] tag = system.tag.readBlocking(tagPaths) if tag[0].value == 'MyPC': success = system.security.switchUser('username', 'password') if success: windowPath = 'User Management/Switch User' system.nav.closeWindow(windowPath) ``` And I added the import system to the defined function because I was getting this error without it: > Traceback (most recent call last): > File "", line 15, in > File "", line 14, in closeWindow > NameError: global name 'system' is not defined > > at org.python.core.Py.NameError(Py.java:261) > at org.python.core.PyFrame.getglobal(PyFrame.java:265) > at org.python.pycode.\_pyx2.closeWindow$1(:14) > at org.python.pycode.\_pyx2.call\_function() > at org.python.core.PyTableCode.call(PyTableCode.java:173) > at org.python.core.PyBaseCode.call(PyBaseCode.java:134) > at org.python.core.PyFunction. **call** (PyFunction.java:416) > at org.python.pycode.\_pyx2.f$0(:16) > at org.python.pycode.\_pyx2.call\_function() > at org.python.core.PyTableCode.call(PyTableCode.java:173) > at org.python.core.PyCode.call(PyCode.java:18) > at org.python.core.Py.runCode(Py.java:1687) > at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:800) > at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:769) > at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:736) > at com.inductiveautomation.factorypmi.application.FPMIApp.startup(FPMIApp.java:486) > at com.inductiveautomation.factorypmi.application.runtime.ClientPanel.lambda$startupApp$8(ClientPanel.java:881) > at java.desktop/java.awt.event.InvocationEvent.dispatch(Unknown Source) > at java.desktop/java.awt.EventQueue.dispatchEventImpl(Unknown Source) > at java.desktop/java.awt.EventQueue$4.run(Unknown Source) > at java.desktop/java.awt.EventQueue$4.run(Unknown Source) > at java.base/java.security.AccessController.doPrivileged(Native Method) > at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) > at java.desktop/java.awt.EventQueue.dispatchEvent(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.desktop/java.awt.EventDispatchThread.run(Unknown Source) > > Ignition v8.1.21 (b2022092908) > Java: Azul Systems, Inc. 11.0.15 and I found a [forum thread](https://forum.inductiveautomation.com/t/global-name-system-is-not-defined/) that told me to import system. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [January 11, 2023, 9:07pm UTC](https://forum.inductiveautomation.com/t/client-event-startup-script-invokelater/68512/3 "2023-01-11T21:07:25Z")
> [@dion.botha](#): > > ```auto > def closeWindow(windowPath): > import system > system.nav.closeWindow(windowPath) > system.util.invokeLater(closeWindow(windowPath), 1000) > > ``` "NoneType object is not callable" - you're _calling_ `closeWindow()`, which has no `return` statement (and thus returns None) - which is then passed into `system.util.invokeLater` and throws the error. `invokeLater` expects the first argument to be a callable reference, and it will be invoked _with no arguments_. So you need to capture any arguments you want to pass in. An easy way to do this (there are lots) is to use a default argument: ```python def closeWindow(windowPath=windowPath): import system system.nav.closeWindow(windowPath) system.util.invokeLater(closeWindow, 1000) ``` ---
**Author:** ![dion.botha](https://avatars.discourse-cdn.com/v4/letter/d/46a35a/32.png) [@dion.botha](https://forum.inductiveautomation.com/u/dion.botha)\ **Post date:** [January 12, 2023, 3:14pm UTC](https://forum.inductiveautomation.com/t/client-event-startup-script-invokelater/68512/4 "2023-01-12T15:14:10Z")
Thanks for the explanation and solution, I was also able to get away with no delay value for the invokeLater call which I am further happy about 😃.