# Error running function from system.util.invokeAsynchronous **URL:** \ **Category:** Ignition\ **Created:** [July 29, 2019, 11:37pm UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973 "2019-07-29T23:37:20Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![mriederer](https://avatars.discourse-cdn.com/v4/letter/m/4af34b/32.png) [@mriederer](https://forum.inductiveautomation.com/u/mriederer)\ **Post date:** [July 29, 2019, 11:37pm UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/1 "2019-07-29T23:37:20Z")
Hello, I’m a bit lost as to where this error is coming from. Seems like the invokeAsync is not liking something. Thanks in advance! ```auto INFO | jvm 1 | 2019/07/29 14:03:03 | E [c.i.i.c.s.b.SystemUtilities] [22:03:03]: Error running function from system.util.invokeAsynchronous INFO | jvm 1 | 2019/07/29 14:03:03 | com.inductiveautomation.ignition.common.script.JythonExecException: TypeError: 'NoneType' object is not callable INFO | jvm 1 | 2019/07/29 14:03:03 | INFO | jvm 1 | 2019/07/29 14:03:03 | at org.python.core.Py.TypeError(Py.java:235) INFO | jvm 1 | 2019/07/29 14:03:03 | at org.python.core.PyObject. __call__ (PyObject.java:316) INFO | jvm 1 | 2019/07/29 14:03:03 | at org.python.core.PyObject. __call__ (PyObject.java:357) INFO | jvm 1 | 2019/07/29 14:03:03 | at com.inductiveautomation.ignition.common.script.ScriptManager.runFunction(ScriptManager.java:647) INFO | jvm 1 | 2019/07/29 14:03:03 | at com.inductiveautomation.ignition.gateway.script.GatewaySystemUtilities$1.run(GatewaySystemUtilities.java:69) INFO | jvm 1 | 2019/07/29 14:03:03 | at java.lang.Thread.run(Unknown Source) INFO | jvm 1 | 2019/07/29 14:03:03 | Caused by: org.python.core.PyException: TypeError: 'NoneType' object is not callable INFO | jvm 1 | 2019/07/29 14:03:03 | INFO | jvm 1 | 2019/07/29 14:03:03 | ... 6 common frames omitted ``` ---
**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:** [July 29, 2019, 11:48pm UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/2 "2019-07-29T23:48:30Z")
Can you post your code? You’re trying to run something that evaluates to null; it’s probably just a scoping issue. ---
**Author:** ![mriederer](https://avatars.discourse-cdn.com/v4/letter/m/4af34b/32.png) [@mriederer](https://forum.inductiveautomation.com/u/mriederer)\ **Post date:** [July 30, 2019, 12:04am UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/3 "2019-07-30T00:04:23Z")
I suspect it’s coming from a Gateway Timer Script? ---
**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:** [July 30, 2019, 3:13pm UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/4 "2019-07-30T15:13:35Z")
By nature of invokeAsynchronous, it’s impossible to tell - all that stack trace is telling you is that there’s some issue with an attempt to invoke an asynch thread - specifically, the object being passed into `system.util.invokeAsynchronous` is null. ---
**Author:** ![mriederer](https://avatars.discourse-cdn.com/v4/letter/m/4af34b/32.png) [@mriederer](https://forum.inductiveautomation.com/u/mriederer)\ **Post date:** [July 30, 2019, 6:00pm UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/5 "2019-07-30T18:00:25Z")
The end goal of this is to provide a summary of process activity after some period (overnight, weekly, etc.) so it was sending out an email for each process change. Possibly the whole thing should be re-worked to send only one email with a summary of all changes... I got rid of the invokeAsynch. I was thinking the executeAndDistribute might need it to send multiple emails in a loop... Not sure. The _sendEmail_ function and new code (i.e. invokeAsynch) are within a _for_ loop as mentioned in the post. Iterating through a SQL table for tank numbers & info. ```auto for n in range(len(pyTankDS)): tankNo = pyTankDS[n][0] tank = 'Tank ' + tankNo #read relevant properties from tag path volume = str(round(system.tag.read('[default]Tank Status History/'+tank+'/Volume').value,1)) def sendEmail(tankNo=tankNo, tank = tank, volume = volume): import system recipients=["jane@test.com","jon@xyz.com"] # system.report.executeAndDistribute(path="xyz", parameters = {"tankNumber":tankNo}, project="xyz", action= "email", actionSettings = {"to":recipients, "smtpServerName":"Mail Server", "from":"jon@xyz.com", "subject":tank + 'test email', "body":tank + " test " + volume}) system.util.invokeAsynchronous(sendEmail) print 'post-email function' system.db.runUpdateQuery('DELETE FROM tank_fills') ``` Changed to: ```auto for n in range(len(pyTankDS)): tankNo = pyTankDS[n][0] tank = 'Tank ' + tankNo #read relevant properties from tag path volume = str(round(system.tag.read('[default]Tank Status History/'+tank+'/Volume').value,1)) recipients=["jane@test.com","jon@xyz.com"] system.report.executeAndDistribute(path="xyz", parameters = {"tankNumber":tankNo}, project="xyz", action= "email", actionSettings = {"to":recipients, "smtpServerName":"Mail Server", "from":"jon@xyz.com", "subject":tank + 'test email', "body":tank + " test " + volume}) print 'post-email function' system.db.runUpdateQuery('DELETE FROM tank_fills') ``` More info on this thread: > [@Waiting for certain time to send email with executeAndDistribute](http://forum.inductiveautomation.com/t/waiting-for-certain-time-to-send-email-with-executeanddistribute/26448/4): > > The emails seem to be sending now, but there is an INDENT EOF error occurring after the script runs. I’m not sure if this is a cause for concern or how to prevent the error. FWIW, this code is in a Gateway Event Timer Script contained within a for loop. def sendEmail(tankNo=tankNo, tank = tank): import system recipients=["jane@test.com","jon@xyz.com"] # system.report.executeAndDistribute(path="xyz", parameters = {"tankNumber":tankNo}, project="xyz", action= "email", actionSetti… ---
**Author:** ![mriederer](https://avatars.discourse-cdn.com/v4/letter/m/4af34b/32.png) [@mriederer](https://forum.inductiveautomation.com/u/mriederer)\ **Post date:** [July 31, 2019, 1:34am UTC](https://forum.inductiveautomation.com/t/error-running-function-from-system-util-invokeasynchronous/26973/6 "2019-07-31T01:34:54Z")
It seems the error was still coming up after I removed the invokeAsynchronous from the script. Would it have tried to use invokeAsynchronous if it was a ‘dedicated’ thread? I switched it over to shared and will see if the error goes away. Otherwise, I don’t see any other code that uses invokeAsynchronous. Maybe there is a scoping option somewhere else that has an invokeAsynchronous option, like an event script or such? Thanks, Michael