Error in loading workflow status page

Question

Hi, 
In workflow process , In one place i have a step - In stage D if task is  rejected the task it needs to go to stage C. Its able to move to stage C , I get a mail,but the workflow stage status is not loading. It shows error .
For most of the stages its able to display . It happens only with few stages.
[bucketHash:B1F6B959] Webpart WorkflowStatusPart failed in OnPreRender. Unique ID:
8e73c99c-3fdc-2077-ace7-20bd1e4a5046 System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.   
 at System.Collections.Generic.Dictionary`2.get_Item(TKey key)   
 at Microsoft.Office.Project.PWA.WebParts.WorkflowStatusPart.BuildElementXml(List`1 pastPhases, List`1 pastStageGuids, Guid currentStageGuid, List`1 futureStageGuids, Guid
branchGuid, List`1 futurePhases, Guid currentPhaseGuid, Dictionary`2 names, Dictionary`2 descs)   
 at Microsoft.Office.Project.PWA.WebParts.WorkflowStatusPart.FillElementAndFormatXml()   
 at Microsoft.Office.Project.PWA.WebParts.WorkflowStatusPart.PWA_OnPreRender(EventArgs e)   
 at Microsoft.Office.Project.PWA.WebParts.PWAResiliencyPart.OnPreRender(EventArgs e) StackTrace:
 at Microsoft.Office.Project.Server.Native.dll: (sig=6fe9d0f9-f450-4d16-9084-949e92911e13|2|microsoft.office.project.server.native.pdb, offset=3C1E)
at Microsoft.Office.Project.Server.Native.dll: (offset=1255D)
Please help
Indresh

Answer 1

Hi Indresh 123,
I would check if you have all the data needed to complete that particular stage. For example, if you check a custom field for a particular value make sure that field has a value (same applies to your workflow variables).
Which project server version are you using? what have you used to build your workflow (visual studio, SP Designer, other)?
Paul