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Simple flexi tasks are not working . here is the Error message .

 

Application error when access /sites/helpdesk/Lists/Workflow Tasks/DispForm.aspx, Error=Cannot find a corresponding human workflow task id for this task.

 

at Nintex.Workflow.HumanApproval.NintexTask.IB4=(SPWeb IR4=, Guid Ih4=, Int32 Ix4=)  

 

at Nintex.Workflow.HumanApproval.NintexTask.RetrieveTask(Int32 spTaskID, SPWeb web, SPList taskList)  

 

at Nintex.Workflow.Forms.ControlTemplates.TaskForm.InitialiseForm()  

 

at Nintex.Workflow.Forms.ControlTemplates.TaskForm.OnInit(EventArgs e)  

 

at System.Web.UI.Control.InitRecursive(Control namingContainer)  

 

at System.Web.UI.Control.InitRecursive(Control namingContainer)  

 

at System.Web.UI.Control.AddedControl(Control control, Int32 index)  

 

at Microsoft.SharePoint.WebPartPages.ListFormWebPart.CreateChildControls()  

 

at System.Web.UI.Control.EnsureChildControls()  

 

at Microsoft.SharePoint.WebPartPages.WebPart.get_WebPartMenu()  

 

at Microsoft.SharePoint.WebPartPages.ListFormWebPart.CreateWebPartMenu()  

 

at Microsoft.SharePoint.WebPartPages.ListFormWebPart.OnLoad(EventArgs e)  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Control.LoadRecursive()  

 

at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

 

 

Please find the attachment for workflow .

 

 

Error in task. Object reference not set to an Error Flexi.pnginstance of an object

Have you run other workflows using FlexiTask recently?  You might try a few steps to isolate this a bit...need to determine if there is a general problem with Workflow or is it really isolated just to Flexi-task actions.  The text of the error message is specific to task actions, but I wonder if other actions will work.

If you replace the FlexiTask some other simple action like "Log to History", will it work without error?  I would test with various other actions to see how widespread the problem is.

Do you have other workflows working with in other sites?

Log to history task is working without any error.

Have you tried using Flexitask in another workflow on a different sub-site or site collection?  You might need to open a support request on this or re-install Nintex Workflow.

‌ did you ever resolve this issue?

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