Allowed ErrorWindow to close properly.

PcgsInvUi/Views/ErrorWindow.axaml

@@ -12,8 +12,7 @@
                Margin="15"
                Content="{Binding DisplayedMessage}" />
         <Button Grid.Row="1" HorizontalAlignment="Center" VerticalAlignment="Bottom"
-                Margin="10" Name="CloseButton" IsEnabled="False"
-                Content="Use X button" Command="{Binding CloseCommand, Mode=OneWay}" 
-                CommandParameter="{Binding ElementName=NameErrorWindow}"/>
+                Margin="10" Name="CloseButton" IsEnabled="True"
+                Content="OK" Command="{Binding CloseCommand, Mode=OneWay}" />
     </Grid>
 </Window>