AttributeError: 'NoneType' object has no attribute 'set_theme'

micropython 1.19.1 error any build problem ???

The problem is in file, line 11, so please send the code from line 1 to 11.
I usually get this "NoneType" object has no attribute '...', when a variable is not set.
In your case I assume you wanted to call the function on display object (which should be set by as: x=lv.disp_get_default() )