TF400481: One or more imported work items are not refreshing correctly because they contain field values that Microsoft Project ...

TF400481: One or more imported work items are not refreshing correctly because they contain field values that Microsoft Project does not allow. The first failing item, work item ID {0} corresponding to Project task ID {1}, contains an invalid value in field '{2}'. To make sure that all project plan data refreshes correctly, update the work item field values in Team Foundation Server and then refresh your project plan.