Run time_error

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1

im trying RE-Framework and i got run time error can anyone help me. I posted the scrnshot

doubt
doubt1920×1080 322 KB
doubt1
doubt1331×664 73.5 KB

2

The error indicates that a variable has not been given a value, but an operation is being attempted on it that cannot be performed when the variable is not set.

Can you share your zipped project folder?

3

Main.xaml (50.0 KB)
this is the main work flow