On Thu, 23 Dec 2021, Tyler Smith wrote: > Have you recently updated R? The error message suggests the .Rdata file was > created by a different version of R than the one you are currently running. Tyler, I saw that, but nothing's changed suince 4:00 pm yesterday. >> -rw-r--r-- 1 rshepard users 28074080 Dec 22 15:32 .RData Thanks, Rich