I keep getting this error, although it worked yesterday but when i tried to knit it it told me there was an error on this

Hi', welcome to the forum.

IT is rather difficult to work from screenshots and we rather discourage their use. See FAQ Asking Questions

It looks like {tidyverse} is successfully installed now. If you are using tinytex I believe it does this automatically.

If I am reading this correctly I think you want

filter(dat_non_NA,  reykir = "ja" & bmi > 25)

If not, would you supply us with your code and some sample data?

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. Just do dput(mydata) where mydata is your data. Copy the output and paste it here.
Thanks