If you are getting error like "unknown timezone 'default/America/Toronto'.", the following workaround would fix it.
- Open or create
.Rprofile file under your home directory.
- In the .RProfile, add the following line. (Replace "America/Toronto" with your timezone. The list of valid timezone names are listed here.)
Sys.setenv(TZ = "America/Toronto")
After that, restart Exploratory and the error should not appear anymore.
This is a known R bug, and will be fixed in R3.4.3, which Exploratory will be using in the next release. After that, this issue will not happen even without this workaround.