'In R markdown file, why can't I knit the file while it can run correctly
I want to load the package names hflights. I think I have load it correctly. And the code at line 64 and 65 can be run, when I the hint the knit button it keeps reminding me the problem is at there. But it can run, the result is shown belown. I don't know why I can not knit my rmd file.
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