Hi @Maria99
When you newly create or open an xaml in UiPath Studio, there are some folders and files generated automatically. Amongst them is the project json file.
(Just like what happened when I opened your Reconcile.xaml file in my Downloads folder.) 
You may learn more about it here
Though I personally do not recommend manually editing the json file because some activities may not work/appear properly and will make debugging more complicated.
Anyways, to address your original issue, maybe you can create a blank project (in VB) and just test first the suggested fix to check if the error no longer appear. Then start from there ~ 
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