[Python] could not convert string to float: 'D' [closed]

im trying to code a classifier for school but this cell does not want to work

data = df_prep[["avg_h", "avg_d", "avg_a", "Mean_3_FTHG", "Mean_3_FTAG", "FTR"]]
corr = data.corr()

mask = np.triu(np.ones_like(corr, dtype=bool))

sns.pairplot(data, hue="FTR", markers=["o", "s","D"], palette="Set2", corner=True)

plt.show()

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