I want to know how I can fix this error on my code .
I'm running RStudio 4.0.0 , when I try to call the function CLD it give's me this error.
I also had in the past this issue and the way I fix it was just reinstalling R and RStudio but this time also after trying again to do this procedure , I was not able.
Also calling the multcomp package before the CLD function is not working ..