[datatable-help] unable to use set to assign vector

[Zachary O'Keeffe]

Hello. Not sure why this is occurring, but I cannot assign a vector to a
594,818 row, 3-column data.table using set. My only guess is that it has
something to do with the fact that it was loaded from readRDS? := worked
with the same vector.

Error:

Error in set(dat, NULL, "psi", round(as.numeric(psimod$residuals), 6L)) :
  Internal error, please report (including result of sessionInfo()) to
datatable-help: oldtncol (0) < oldncol (3) but tl of class is marked.

Session info:

R version 3.3.3 (2017-03-06)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: CentOS Linux 7 (Core)

locale:
 [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C
 [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8
 [5] LC_MONETARY=en_US.utf8    LC_MESSAGES=en_US.utf8
 [7] LC_PAPER=en_US.utf8       LC_NAME=C
 [9] LC_ADDRESS=C              LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C

attached base packages:
[1] parallel  stats     graphics  grDevices utils     datasets  methods
[8] base

other attached packages:
[1] ggplot2_2.2.1     doMC_1.3.5        iterators_1.0.9   foreach_1.4.4
[5] bit64_0.9-7       bit_1.1-12        data.table_1.10.5

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.15     codetools_0.2-15 grid_3.3.3       plyr_1.8.4
 [5] gtable_0.2.0     scales_0.5.0     pillar_1.1.0     rlang_0.1.6
 [9] lazyeval_0.2.1   munsell_0.4.3    colorspace_1.3-2 tibble_1.4.2
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