Hi David,
a fix is implemented in the development version already, but not released yet. So for time being, please convert the Problem columns to character before using cameraOperation(). The easiest way would be to run as.character(). Or use the code snippet below, which is straight from the function and converts all problem columns to character.
# find problem columns
cols.prob.from <- grep(colnames(CTtable), pattern = "Problem\\d\\Sfrom")
cols.prob.to <- grep(colnames(CTtable), pattern = "Problem\\d\\Sto")
# convert problem columns to character
CTtable[, problem_col_index] <- as.character(CTtable[, problem_col_index])
}
In the next release it will be done automatically inside the function. Currently, it is work in progress as I'm changing a few more things in cameraOperation(). I'll notify you here in the group when the new version is released.
Thank you for your patience.
Best regards,
Jürgen