new to R (vegan) , confused on data format

I have never used this before or anything like it! I'm doing an ecology assignment and need to create a "Non-metric dimensional scaling attempts to plot the similarity of sites in two dimensions". I have data of fish surveys from 7 different sites, 7 divers, and roughly 50 species. I keep getting the error that my data must be numerical but I thought it was so I'm not sure how my data should be formatted.
This is what I have entered. Thank you for any assistance!

diversity(Book3, index = "shannon")

Please post a snippet of your data so we can confirm whether it is in the right format.

A handy way to supply some sample data is the dput() function. In the case of a large dataset something like dput(head(mydata, 100)) should supply the data we need.

Species Name Site Diver Diver Diver Diver Diver Diver Diver
Slate Pencil Sea Urchin La Loberia 3 3 2 0 2 2 2
Black Urchin La Loberia 0 0 0 0 0 0 0
Green Urchin La Loberia 0 0 0 0 0 0 0
Black Striped Salema La Loberia 1 0 2 3 2 3 2
Tomtate Grunt La Loberia 0 0 2 2 0 0 0

Thanks but that format for the data is not really very useful. Please supply some data in dput() format as suggested above.

Actually now that I look at the code it is not clear where *Book3 is coming from.

When I try


I get

Error: object 'Book3' not found

so it looks like Book3 is not a dataset included with vegan. How are you loading Book3?

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