error in binding validation rule class in textbox

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C#

ASP.NET

WPF

hi, i am trying to bind a validation rule class in textbox , but it throw this error.

{"A 'Binding' cannot be set on the 'Path' property of type 'Binding'. A 'Binding' can only be set on a DependencyProperty of a DependencyObject."}

my code is

<TextBox x:Name="txtGTIN" Grid.Column="4" Grid.Row="1" Validation.ErrorTemplate="{StaticResource validationErrorTemplate}">
                  <TextBox.Text>
                  <Binding  Path="{Binding MetaData.GTIN}" Mode="TwoWay" UpdateSourceTrigger="PropertyChanged">
                          <Binding.ValidationRules>
                              <ExceptionValidationRule/>
                          <viewModel:NewECGConfigurationViewModel/>

                          </Binding.ValidationRules>
                      </Binding>
                  </TextBox.Text>
              </TextBox>

it throw error in Path