[YouTube-API] unable to delete Video

hi i'm using 1.0  python api. i have this code:

import gdata.youtube

import gdata.youtube.service

import math

yt_service = gdata.youtube.service.YouTubeService()

yt_service.email = '****@gmail.com'

yt_service.password = '**password***'

yt_service.source = 'moaradepiatra'

yt_service.developer_key = 'AI39si6mLBFZSZtY12iSVA7t7RL2vfnnq508tUqYD_W02dUYEpMpuYzlTmFDaF5lPhq32Xw9rm4WXaldyLn3Sn6YT6mM0qm6aA'

yt_service.client_id = 'moaradepiatra'

yt_service.ProgrammaticLogin()

def deleteEntry():

   # video_id = str(request.vars.yt_id) 

    entry = yt_service.GetYouTubeVideoEntry(video_id = 'PBjgURzmV88')

    response = yt_service.DeleteVideoEntry(entry)

    if response:

      return 'Video successfully deleted!'

    else: return str(response)  

function always returns "None" so the entry wont delete.  can anyone help? thx

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