An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code

An exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll but was not handled in user code

Additional information: Invalid object name sp_VehicleInfo.

protected void btnRegister_Click(object sender, EventArgs e)
{
        VehicleInfo vehicle = new VehicleInfo();
        vehicle.VehicleNo = txtVehicleNo.Text;
        vehicle.Make = txtMake.Text;
        vehicle.Model = txtEmail.Text;
        vehicle.Variety = txtVersion.Text;
        //vehicle.isAc = radAC.Text;
        vehicle.EngineNo = TextBox1.Text;
        vehicle.LExpDate = txtLicenseExpDate.Text;
        vehicle.InsuranceNo = TextBox2.Text;
        vehicle.IExpDate = txtInsuranceExpDate.Text;
        vehicle.Insert(); 
}

[dbo].[sp_VehicleInfo]              
    @VehicleNo NVARCHAR(50) = NULL,
    @Make NVARCHAR(50) = NULL,
    @Model NVARCHAR(50) = NULL,
    @Variety NVARCHAR(50) = NULL,
    @isAc BIT = NULL,
    @EngineNo NVARCHAR(50) = NULL,
    @LExpDate NVARCHAR(50) = NULL,
    @InsuranceNo NVARCHAR(50) = NULL,
    @IExpDate NVARCHAR(50) = NULL,
    @VehicleId bigint = NULL,
    @mode NVARCHAR(50)
AS
BEGIN
    IF(@mode = 'insert')
    BEGIN
        INSERT INTO sp_VehicleInfo (VehicleNo, Make, Model, Variety, isAc, EngineNo, LExpDate, InsuranceNo, IExpDate)
        OUTPUT inserted.VehicleNo
        VALUES (@VehicleNo, @Make, @Model, @Variety, @isAc, @EngineNo, @LExpDate, @InsuranceNo, @IExpDate)
    END

    IF(@mode = 'update')
    BEGIN
        UPDATE sp_VehicleInfo
        SET VehicleNo = Isnull(@VehicleNo, VehicleNo),
            Make = Isnull(@Make, Make),
            Model = Isnull(@Model, Model),
            Variety = Isnull(@Variety, Variety),
            isAc = Isnull(@isAc, isAc),
            EngineNo = Isnull(@EngineNo, EngineNo),
            LExpDate = Isnull(@LExpDate, LExpDate),
            InsuranceNo = Isnull(@InsuranceNo, InsuranceNo),
            IExpDate = Isnull(@IExpDate, IExpDate)
        WHERE 
            VehicleId = @VehicleId
    END

    IF(@mode = 'get' )
    BEGIN
        SELECT * 
        FROM sp_VehicleInfo 
        WHERE VehicleId = @VehicleId
    END

    IF(@mode = 'delete') 
    BEGIN
        DELETE FROM sp_VehicleInfo  
        WHERE VehicleId = @VehicleId
    END
END