The property was not found in ObjectdataProvider

Question

<TextBlock Text="{Binding Path=String46 , Source={StaticResource CurrentResources}}">

This code works at runtime, and there are no errors when building the project. However, each time I modify the xaml code 'String46' is underlined with the following tooltip :

"The property was not found in ObjectdataProvider".

This only appears in VS2017, not in older VS versions.