python - Pivot table problems: error 'No numeric types to aggregate' -

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i can't figure out why pivot table isn't working, here pivot table , sample of data i'm working with:

def pivot():     pivot = pd.pivot_table(clean(),index=['channel','advertiser domain'],values=['ecpm'],columns=['date'],aggfunc=np.mean)     return pivot  t = clean() t.ix[0] channel                              col1 advertiser domain         whitecastle.com bids                                35483 imp.                                20336 avg. bid cpm (usd)                   8.13 revenue (usd)                      148.96 ecpm (usd)                           7.33 wins                                83.97 date                  2015-04-14 00:00:00 name: 0, dtype: object

output t.info():

channel               13601 non-null object advertiser domain     13601 non-null object bids                  13601 non-null float64 imp.                  13601 non-null float64 avg. bid cpm (usd)    13601 non-null float64 revenue (usd)         13601 non-null float64 ecpm (usd)            13601 non-null float64 wins                  13601 non-null float64 date                  13601 non-null datetime64[ns] dtypes: datetime64[ns](1), float64(6), object(2) memory usage: 1.0+ mb


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