Undefined CLR namespace

Question

I have the following:

The error says The \'clr-namespace\' URI refers to a na

Answer 1

Assuming your ViewModel folder isn't empty (or there actually is a type with BlooblieBlablie.ViewModel as its namespace), and BlooblieBlablie is the assembly name, the following should work:

xmlns:vm="clr-namespace:BlooblieBlablie.ViewModel;assembly=BlooblieBlablie"