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Power Platform Community / Forums / Power Automate / 400 error Value cannot...
Power Automate
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400 error Value cannot be null in body of Send an HTTP request to update the Modified by field

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Posted on by 546
Based on a post from Tom Riha, I'm working on a flow that gets triggered when someone modifies a file in a document library.
 
 
Note: The word Body: in the above image has been removed.
The field value resolves because I'm testing it with my email.  Here are the body results:

{
    "formValues":[
    {
        "FieldName": "Editor",
        "FieldValue": "[{'Key':'i:0#.f|membership|Stephen.Morley@Dal.Ca'}]"
    }
    ],
"bNewDocumentUpdate": true
}
 
Here is the error in the Output:
{
  "status"400,
  "message""Value cannot be null.\r\nParameter name: formValues\r\nclientRequestId: 81e408b0-e531-40fd-8339-c6b12daab7d6\r\nserviceRequestId: 33084ba1-908f-6000-5391-fc2cb59c40fd",
  "source""https://mysharepointsite.com/_api/web/lists/getbytitle('Med%203%20General%20Exam%20Documents')/items(2226)/validateUpdateListItem",
  "errors": [
    "-2147467261",
    "System.ArgumentNullException"
  ]
}
 
Any help would be greatly appreciated!
Categories:
I have the same question (8)
  • Verified answer
    smorley Profile Picture
    546 on at
    I recreated the workflow from scratch following Tom Riha's instructions to the letter, and I found I had a syntax error.  All is well.
  • CC-08100850-0 Profile Picture
    3 on at
    I have the same problem with updating a managed metadata column, I even tried manually changing in sharepoint then copying and pasting the body and headers exactly, same error Value cannot be null

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