Empty 'DataFrame': no numeric data to plotの対処について

excelで作成されたデータを､pd.read_excel（）にて読み込んでいます｡さらにデータを加工・抽出し､グラフを描こうとすると､以下のエラーが出てしまいます｡

excelで作成されたデータを､pd.read_excel（）にて読み込んでいます｡

さらにデータを加工・抽出し､グラフを描こうとすると､以下のエラーが出てしまいます｡

TypeError: Empty 'DataFrame': no numeric data to plot

対処方法を､ご教示くださいませ｡

import pandas as pd

## xlsファイルの読み込み
df=pd.read_excel('f005-30-027.xls')

#列､行の欠損値の削除､不要な１行目の削除
df=df.dropna(how='all').dropna(how='all',axis=1).drop(1)
df.head()

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