Webdebugger

b.py

import kivy
from kivy.uix.widget import Widget
from kivy.app import App
from kivy.lang import Builder

from kivy.loader import Loader

kvs1='''
BoxLayout:
	orientation: 'vertical'
	BoxLayout:
'''
kvs = kvs1 

root = Builder.load_string(kvs)	

class MainApp(App): #Main function#

	def build(self):
		# temporary commands


		return root
	

if __name__ == '__main__':
    MainApp().run()

gives


C:\Kivy\nstar\recent version>python northernstar.py -m webdebugger
[INFO              ] Kivy v1.8.0-dev
[INFO              ] [Logger      ] Record log in C:\Users\Andreas\.kivy\logs\ki
vy_14-02-07_56.txt
[ERROR             ] [WebDebugger ] unable to import Flask. Install it!
[ERROR             ] [WebDebugger ] unable to import Flask. Install it!
[ERROR             ] [Modules     ] unable to import <webdebugger>
Traceback (most recent call last):
  File "C:\Kivy\kivy\kivy\modules\__init__.py", line 151, in import_module
    module = __import__(name=name)
  File "C:\Kivy\kivy\kivy\modules\webdebugger.py", line 28, in <module>
    from kivy.modules._webdebugger import start, stop
  File "C:\Kivy\kivy\kivy\modules\_webdebugger.py", line 12, in <module>
    from flask import Flask, render_template_string, make_response
ImportError: No module named flask
[INFO              ] [Factory     ] 156 symbols loaded
[DEBUG             ] [Cache       ] register <kv.image> with limit=None, timeout
=60s
[DEBUG             ] [Cache       ] register <kv.atlas> with limit=None, timeout
=Nones
[INFO              ] [Image       ] Providers: img_tex, img_dds, img_pygame, img
_pil, img_gif
[DEBUG             ] [Cache       ] register <kv.texture> with limit=1000, timeo
ut=60s
[DEBUG             ] [Cache       ] register <kv.shader> with limit=1000, timeou
t=3600s
[DEBUG             ] [Cache       ] register <kv.lang> with limit=None, timeout=
Nones
[DEBUG             ] [Cache       ] register <kv.loader> with limit=500, timeout
=60s
[INFO              ] [Loader      ] using a thread pool of 2 workers
[DEBUG             ] [Window      ] Ignored <egl_rpi> (import error)
[INFO              ] [Window      ] Provider: pygame(['window_egl_rpi'] ignored)

[DEBUG             ] [Window      ] Display driver windib
[DEBUG             ] [Window      ] Actual window size: 800x600
[DEBUG             ] [Window      ] Actual color bits r8 g8 b8 a8
[DEBUG             ] [Window      ] Actual depth bits: 24
[DEBUG             ] [Window      ] Actual stencil bits: 8
[DEBUG             ] [Window      ] Actual multisampling samples: 4
GLEW initialization succeeded
[INFO              ] [GL          ] OpenGL version <3.3.0 - Build 8.15.10.2656>
[INFO              ] [GL          ] OpenGL vendor <Intel>
[INFO              ] [GL          ] OpenGL renderer <Intel(R) HD Graphics>
[INFO              ] [GL          ] OpenGL parsed version: 3, 3
[INFO              ] [GL          ] Shading version <3.30 - Intel Build 8.15.10.
2656>
[INFO              ] [GL          ] Texture max size <8192>
[INFO              ] [GL          ] Texture max units <16>
[INFO              ] [Shader      ] fragment shader: <No errors.>
[DEBUG             ] [Shader      ] Fragment compiled successfully
[INFO              ] [Shader      ] vertex shader: <No errors.>
[DEBUG             ] [Shader      ] Vertex compiled successfully
[INFO              ] [Shader      ] program: <No errors.>
[DEBUG             ] [ImagePygame ] Load <C:\Kivy\kivy\kivy\data\glsl\default.pn
g>
[ERROR             ] [WebDebugger ] unable to import Flask. Install it!
[ERROR             ] [WebDebugger ] unable to import Flask. Install it!
[ERROR             ] [Modules     ] unable to import <webdebugger>
Traceback (most recent call last):
  File "C:\Kivy\kivy\kivy\modules\__init__.py", line 151, in import_module
    module = __import__(name=name)
  File "C:\Kivy\kivy\kivy\modules\webdebugger.py", line 28, in <module>
    from kivy.modules._webdebugger import start, stop
  File "C:\Kivy\kivy\kivy\modules\_webdebugger.py", line 12, in <module>
    from flask import Flask, render_template_string, make_response
ImportError: No module named flask
 Traceback (most recent call last):
   File "C:\Kivy\kivy\kivy\modules\__init__.py", line 222, in update
     self.activate_module(name, win)
   File "C:\Kivy\kivy\kivy\modules\__init__.py", line 179, in activate_module
     pymod = mod['module']
 KeyError: 'module'
[WARNING           ] [WinPygame   ] SDL wrapper failed to import!
[DEBUG             ] [Window      ] Ignored <sdl> (import error)
[DEBUG             ] [Window      ] Ignored <x11> (import error)
[CRITICAL          ] [Window      ] Unable to find any valuable Window provider
at all!
[DEBUG             ] [App         ] Loading kv <.\main.kv>
[DEBUG             ] [App         ] kv <.\main.kv> not found
 Traceback (most recent call last):
   File "northernstar.py", line 30, in <module>
     MainApp().run()
   File "C:\Kivy\kivy\kivy\app.py", line 761, in run
     Window.add_widget(self.root)
 AttributeError: 'NoneType' object has no attribute 'add_widget'