Error in diversity(x, index = "shannon") : input data must be numeric

General
1

Hello, I have installed the "vegan" package and when I run my code
shan <- diversity (x, index = "shannon")
simp <- diversity (x, index = "simpson")
it says Error Error in diversity(x, index = "shannon") : input data must be numeric

Please help me!

2

What are the results of the commands

class(x)
str(x)
3

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