Validator message is not visible

The validator message in RadzenGrid, RadzenDataGrid for the input text field is not displayed at all. Sometimes displayed in the table for some of the fields, never in a table with one row (not visible outside the table). Could it be related to the bootstrap version?

How you validate the input text field ? code sample please. (like <RadzenRequiredValidator) is not work in RadzenGrid. You need to validate in server side code. Thanks !