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https://nishantrana.me/2013/10/03/a-type-named-sp-data-listitem-could-not-be-resolved-by-the-model-when-a-model-is-available-each-type-name-must-resolve-to-a-valid-type-error-in-sharepoint-2013/
“A type named ’SP.Data.ListItem’ could not be resolved by the model. When a model is available, each type name must resolve to a valid type” error in SharePoint 2013