Failed to retrieve form from workflow with flexi task in running workflow

  • 19 January 2023
  • 0 replies

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We have a problem with flexi tasks in Nintex ( latest version). It seems related to the december SP2019 CU. When a user wants to handle a task (which was already started before the CU, so with a running workflow). An error occurs. This is the ULS:

Failed to retrieve form from workflow. Error: Value cannot be null.  Parameter name: s. Stack trace:    at System.IO.StringReader..ctor(String s)     at Nintex.Workflow.WorkflowConfig2010.LoadWorkflowConfig(String configXml)     at Nintex.Workflow.Forms.ControlTemplates.TaskForm.GetWorkflowConfig()     at Nintex.Workflow.Forms.ControlTemplates.TaskForm.GetForm(String formKey, FormData formData, Boolean hasEnterpriseLicense)    b8b68da0-cd82-0049-f307-c0152e223f98

Anybody an idea what the cause can be and how to resolve this? Thanks. 

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