It'll be easier to help you if you can turn this into a self-contained reprex (short for reproducible example)—more detail, below. However, from what you've shown, it seems that you're, in effect, calling isea4h9 as though it were a function (parentheses after with an assignment operator to a new variable), which it either is not, or you haven't attached the package in which it is a function (given that it's what you name the data that you read in, I'm guessing it's the former).
install.reprex("reprex")
If you've never heard of a reprex before, you might want to start by reading the tidyverse.org help page. The reprex dos and don'ts are also useful.
What to do if you run into clipboard problems
If you run into problems with access to your clipboard, you can specify an outfile for the reprex, and then copy and paste the contents into the forum.
reprex::reprex(input = "fruits_stringdist.R", outfile = "fruits_stringdist.md")
For pointers specific to the community site, check out the reprex FAQ, linked to below.