# System CurrentDateTime frozen **URL:** \ **Category:** Ignition\ **Created:** [June 14, 2017, 4:58am UTC](https://forum.inductiveautomation.com/t/system-currentdatetime-frozen/14511 "2017-06-14T04:58:57Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mecon2](https://avatars.discourse-cdn.com/v4/letter/m/65b543/32.png) [@mecon2](https://forum.inductiveautomation.com/u/mecon2)\ **Post date:** [June 14, 2017, 4:58am UTC](https://forum.inductiveautomation.com/t/system-currentdatetime-frozen/14511/1 "2017-06-14T04:58:57Z")
Hi All, My system tag "[System]Gateway/CurrentDateTime" is frozen to the instance the gateway started. All my scripts which reference this tag value are returning: > Traceback (most recent call last): > File "event:visionWindowOpened", line 2, in > File "module:project.EventLog", line 28, in LogEvent > at org.python.core.PyString.(PyString.java:35) > at org.python.core.PyString.(PyString.java:42) > at org.python.core.PyException.(PyException.java:61) > at org.python.core.Py.ValueError(Py.java:309) > at com.inductiveautomation.ignition.common.script.builtin.DateUtilities.format(DateUtilities.java:309) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > at java.lang.reflect.Method.invoke(Unknown Source) > java.lang.IllegalArgumentException: java.lang.IllegalArgumentException: Cannot create PyString from null! > at org.python.core.Py.JavaError(Py.java:495) > at org.python.core.Py.JavaError(Py.java:488) > at org.python.core.PyReflectedFunction. **call** (PyReflectedFunction.java:188) > at org.python.core.PyReflectedFunction. **call** (PyReflectedFunction.java:204) > at org.python.core.PyObject. **call** (PyObject.java:404) > at org.python.core.PyObject. **call** (PyObject.java:408) > at org.python.pycode._pyx4.LogEvent$1(module:project.EventLog:55) > at org.python.pycode.pyx4.call\_function(module:project.EventLog) > at org.python.core.PyTableCode.call(PyTableCode.java:165) > at org.python.core.PyBaseCode.call(PyBaseCode.java:301) > at org.python.core.PyFunction.function\_\_\_call_(PyFunction.java:376) > at org.python.core.PyFunction. **call** (PyFunction.java:371) > at org.python.core.PyFunction. **call** (PyFunction.java:361) > at org.python.pycode.\_pyx6.f$0(event:visionWindowOpened:2) > at org.python.pycode.\_pyx6.call\_function(event:visionWindowOpened) > at org.python.core.PyTableCode.call(PyTableCode.java:165) > at org.python.core.PyCode.call(PyCode.java:18) > at org.python.core.Py.runCode(Py.java:1275) > at com.inductiveautomation.ignition.common.script.ScriptManager.runCode(ScriptManager.java:647) > at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.runActions(ActionAdapter.java:183) > at com.inductiveautomation.factorypmi.application.binding.action.ActionAdapter.invoke(ActionAdapter.java:284) > at com.inductiveautomation.factorypmi.application.binding.action.RelayInvocationHandler.invoke(RelayInvocationHandler.java:55) > at com.sun.proxy.$Proxy16.visionWindowOpened(Unknown Source) > at com.inductiveautomation.factorypmi.application.FPMIWindow.fireVisionWindowOpened(FPMIWindow.java:726) > at com.inductiveautomation.factorypmi.application.VisionDesktop$RuntimeWindowOpener.openWindow(VisionDesktop.java:520) > at com.inductiveautomation.factorypmi.application.VisionDesktop.openWindow(VisionDesktop.java:193) > at com.inductiveautomation.factorypmi.application.VisionDesktop.openWindow(VisionDesktop.java:185) > at com.inductiveautomation.factorypmi.application.FPMIApp.startup(FPMIApp.java:510) > at com.inductiveautomation.factorypmi.application.runtime.ClientPanel$13$1.run(ClientPanel.java:698) > at java.awt.event.InvocationEvent.dispatch(Unknown Source) > at java.awt.EventQueue.dispatchEventImpl(Unknown Source) > at java.awt.EventQueue.access$500(Unknown Source) > at java.awt.EventQueue$3.run(Unknown Source) > at java.awt.EventQueue$3.run(Unknown Source) > at java.security.AccessController.doPrivileged(Native Method) > at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source) > at java.awt.EventQueue.dispatchEvent(Unknown Source) > at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) > at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) > at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) > at java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.awt.EventDispatchThread.pumpEvents(Unknown Source) > at java.awt.EventDispatchThread.run(Unknown Source) > Caused by: java.lang.IllegalArgumentException: Cannot create PyString from null! > at org.python.core.PyString.(PyString.java:35) > at org.python.core.PyString.(PyString.java:42) > at org.python.core.PyException.(PyException.java:61) > at org.python.core.Py.ValueError(Py.java:309) > at com.inductiveautomation.ignition.common.script.builtin.DateUtilities.format(DateUtilities.java:309) > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) > at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) > at java.lang.reflect.Method.invoke(Unknown Source) > at org.python.core.PyReflectedFunction. **call** (PyReflectedFunction.java:186) > ... 40 more > Ignition v7.9.1 (b2017012511) > Java: Oracle Corporation 1.8.0\_101 And if I point a expression tag to the CurrentDateTime tag, it returns _null_. We have tried restarting the gateway, restoring backups and restarting the machine... Running out of ideas. Any help would be much appreciated. Thanks, Cem ---
**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:** [June 14, 2017, 2:49pm UTC](https://forum.inductiveautomation.com/t/system-currentdatetime-frozen/14511/2 "2017-06-14T14:49:03Z")
Try updating Ignition; there was an issue that could crop up with the system tags on 7.9.0/1.