MarySC ,
Good day,
I'm sending you an example:
context.Form.Get("TransportCompany").AddError("Integration keys with the Transport Company are not set or are incorrect")
context.Form.GetForm("1fe65ccf-50f0-42d3-b18b-da99971f4faa").Get("NumberRecipient").AddError("Enter a number starting with +7")
context.Form.GetForm("1fe65ccf-50f0-42d3-b18b-da99971f4faa").Get("NumberRecipient").ClearError()