Batch Loader displays fail message when uploading mass data in PLMA

I am trying to update PLMA with values in the field which are currently blank using a primary key in a Tab delimited Text file.

I am getting an autogenerated template in Batch loader

<Item type='Part' action='edit'>
<item_number>@1</item_number>
<_stuff_master_uid>@2</_stuff_master_uid>
</Item>

I can verify the data, but when I try to load, it gives me a fail result

Error message: 

SOAP-ENV:Server.MissingCriteriaException

Aras.Server.Core.MissingCriteriaException

Can I get guidance on why am I getting the error message ?

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