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digitalmars.D.learn - dub generate visuald shits on me

I do:

dub init simple_type_theory
cd simple_type_theory
dub generate visuald

Errors:

C:\Users\FruitfulApproach\Desktop\_SIMPLE_TYPE_THEORY\simple_type_theory>dub
generate visuald simple_type_theory
Building package simple_type_theory in 
C:\Users\FruitfulApproach\Desktop\_SIMPLE_TYPE_THEORY\simple_type_theory\
Cannot open file `.dub\simple_type_theory.visualdproj' in mode 
`wb' (No such file or directory)
Jan 11