Why it is showing "Error in library("reshape2") : there is no package called 'reshape2'". Thanks

Hi Klaudyna, thanks for reaching out! It's possible you're receiving the error if the library isn't installed. So, the first time you're using a certain library you should installed with: install.packages("reshape2") This is done only the first time you're using the library. Then you can run your code as usual, accessing the library with: library("reshape2") Hope this helps! Best, 365 Eli