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• Michel Boivin commented  ·  September 22, 2016 11:28 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  Ran into the exact same issue on a few systems. Running "mofcomp C:\Windows\System32\wbem\SchedProv.mof" does resolve the problem.

  I'm calling the New-ScheduledTaskTrigger cmdlet as part of the installation
  process of an application I'm developing. I'm concerned about adverse effects
  of calling mofcomp without the user being aware. Should mofcomp be reserved to
  sys admins or it's a failure safe operation I can add to my installation
  process without risk?

• guitarrapc_tech commented  ·  March 9, 2016 9:59 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  Any update with? I have this issue long time with WMF 5 and also other users experience same issues. https://github.com/guitarrapc/DSCResources/issues/58

• Robert Smit commented  ·  February 1, 2016 10:03 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  Got this issue during the deployment from Azurestack. This need to be fixed in TP5

• Mathieu Buisson commented  ·  January 17, 2016 11:03 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  Well done David !

  After running the command : mofcomp C:\Windows\System32\wbem\SchedProv.mof ,
  I have no problem anymore with the parameter -Once as well.

  Also, it made additional methods visible for the PS_ScheduledTask CIM class :

  PS C:\> $PS_ScheduledTaskClass = Get-CimClass -Namespace root/Microsoft/Windows/TaskScheduler -ClassName PS_Sched
  uledTask
  PS C:\> $PS_ScheduledTaskClass.CimClassMethods.Name
  RegisterByObject
  RegisterByPrincipal
  RegisterByUser
  RegisterByXml
  NewActionByExec
  NewPrincipalByGroup
  NewPrincipalByUser
  NewSettings
  StartByObject
  StartByPath
  StopByObject
  StopByPath
  SetByObject
  SetByPrincipal
  SetByUser
  GetInfoByName
  GetInfoByObject
  New
  ExportByName
  ExportByObject
  EnableByName
  EnableByObject
  DisableByName
  DisableByObject
  NewTriggerByDaily
  NewTriggerByOnce
  NewTriggerByLogon
  NewTriggerByStartup
  NewTriggerByWeekly

• Mathieu Buisson commented  ·  January 17, 2016 10:41 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  Same error when using the -Once parameter of New-ScheduledTaskTrigger .

  For example :

  PS C:\> New-ScheduledTaskTrigger -Once -At "18:00"
  New-ScheduledTaskTrigger : Method "NewTriggerByOnce" not found
  At line:1 char:1
  + New-ScheduledTaskTrigger -Once -At "18:00"
  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  + CategoryInfo : ObjectNotFound: (PS_ScheduledTask:Root/Microsoft/...S_ScheduledTask) [New-Schedul
  edTaskTrigger], CimException
  + FullyQualifiedErrorId : HRESULT 0x80041002,New-ScheduledTaskTrigger

  I am also using build 1511 of Windows 10.
  PS C:\> $PSVersionTable

  Name Value
  ---- -----
  PSVersion 5.0.10586.63
  PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
  BuildVersion 10.0.10586.63
  CLRVersion 4.0.30319.42000
  WSManStackVersion 3.0
  PSRemotingProtocolVersion 2.3
  SerializationVersion 1.1.0.1

  This has been encountered by several people, here for example :
  http://powershell.org/wp/forums/topic/method-newtriggerbyonce-not-found/

  This may be interesting information to troubleshoot :

  PS C:\> $error[0].categoryinfo

  Category : ObjectNotFound
  Activity : New-ScheduledTaskTrigger
  Reason : CimException
  TargetName : PS_ScheduledTask
  TargetType : Root/Microsoft/Windows/TaskScheduler/PS_ScheduledTask

  It seems the cmdlet cannot find a method called "NewTriggerByOnce" of the CIM class PS_ScheduledTask.

  PS C:\> $PS_ScheduledTaskClass = Get-CimClass -Namespace root/Microsoft/Windows/TaskScheduler -ClassName PS_ScheduledTask

  PS C:\> $PS_ScheduledTaskClass.CimClassMethods.Name
  RegisterByObject
  RegisterByPrincipal
  RegisterByUser
  RegisterByXml
  NewActionByExec
  NewPrincipalByGroup
  NewPrincipalByUser
  NewSettings
  StartByObject
  StartByPath
  StopByObject
  StopByPath
  SetByObject
  SetByPrincipal
  SetByUser
  GetInfoByName
  GetInfoByObject
  New
  ExportByName
  ExportByObject
  EnableByName
  EnableByObject
  DisableByName
  DisableByObject

  Indeed, the method is not visible here.

  PS C:\> Get-CimClass -MethodName "*TriggerByOnce*"

  --> Nothing.
  So I can't see any CIM class which has a method with a name similar to what the cmdlet is looking for.

• David Jones commented  ·  January 17, 2016 10:20 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  In summary. from an elevated prompt run

  mofcomp C:\Windows\System32\wbem\SchedProv.mof

• David Jones commented  ·  January 17, 2016 10:18 AM  ·  Flag as inappropriateFlag as inappropriate  ·  Delete…

  workarround:
  PS C:\WINDOWS\system32> New-ScheduledTaskTrigger -AtStartup
  New-ScheduledTaskTrigger : Method "NewTriggerByStartup" not found
  At line:1 char:1
  + New-ScheduledTaskTrigger -AtStartup
  + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  + CategoryInfo : ObjectNotFound: (PS_ScheduledTask:Root/Microsoft/...S_ScheduledTask) [New-ScheduledTaskT
  rigger], CimException
  + FullyQualifiedErrorId : HRESULT 0x80041002,New-ScheduledTaskTrigger

  PS C:\WINDOWS\system32> mofcomp C:\Windows\System32\wbem\SchedProv.mof
  Microsoft (R) MOF Compiler Version 10.0.10586.0
  Copyright (c) Microsoft Corp. 1997-2006. All rights reserved.
  Parsing MOF file: C:\Windows\System32\wbem\SchedProv.mof
  MOF file has been successfully parsed
  Storing data in the repository...
  Done!
  PS C:\WINDOWS\system32> New-ScheduledTaskTrigger -AtStartup

  Enabled : True
  EndBoundary :
  ExecutionTimeLimit :
  Id :
  Repetition :
  StartBoundary :
  Delay :
  PSComputerName :

  PS C:\WINDOWS\system32>