About the installation issue, you are missing a package dependency (i.e. irr package), try installing it first
install.packages("irr")
About the problem with deducer, the documentation says
Deducer is designed to be used with the Java based R console JGR, though it supports a number of other R environments (e.g. Windows RGUI and RTerm).
It doesn't seem to be compatible with RStudio, so try to run it on one of the recommended environments.
Note: Please do not use screenshots here, they are not very useful, use formatted code instead