"Invalid Input" when submitting Request

"Invalid Input" when submitting Request

Hi, 

I have a customize request template with an additional picklist auto-populate from CSV file. 
After filling up the form and upon submission of request. Got the following message: 
  1. response_status{status_code: 4000,…}
    1. messages[{status_code: 4001, field: "udf_pick_3308", type: "failed", message: "Invalid Input"}]
      1. 0{status_code: 4001, field: "udf_pick_3308", type: "failed", message: "Invalid Input"}
        1. field"udf_pick_3308"
        2. message"Invalid Input"
        3. status_code4001
        4. type"failed"
    2. status"failed"
    3. status_code4000

Can anyone assist on this. 
Thanks!

Law


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