Error appending data using RODBC, sqlSave()

I need to update tables in an MS Access database, but sqlSave(..., append =
TRUE) keeps returning errors. I've spent the better part of the last hour
on Google, but haven't found an adequate answer. Here's my code.

#+ Munge ----

# Call in resampled plots from CRC_Data.DB
resample <- sqlFetch(CRC_Data.DB, "tblResampledPlots")
glimpse(resample)

Observations: 58
Variables: 7
$ PlotID           (fctr) C057, C085, C091, C128, C133, C233, C284, C311,
C312, C401, C418, ...
$ Re-sampleDate    (time) 2014-07-24, 2014-08-29, 2014-09-27, 2014-10-01,
2014-08-30, 2014-0...
$ Notes            (str) NA, NA, Something important about the plot visit...
$ SppRichStartTime (time) 13:09:00, 11:23:00, 13:54:00...
$ SppRichEndTime   (time) 13:21:00, 11:38:00, 14:15:00...
$ SppRichNotes     (fctr) NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA, NA,
NA, NA, NA, NA, NA...
$ SppRichTotalTime (time) 00:12:00, 00:15:00, 00:21:00...

# Call in resampled plots from Summaries.DB
plots.sum = sqlFetch(Summaries.DB, "tblPlotsResampled")
glimpse(plots.sum)

Observations: 52
Variables: 3
$ PlotID        (fctr) C021, C057, C085, C091, C128, C133, C233, C284,
C311, C312, C401, C41...
$ Re-sampleDate (time) 2014-08-29, 2014-07-24, 2014-08-29, 2014-09-27,
2014-10-01...
$ Notes         (fctr) NA, NA, NA, Something important about the plot
visit...

# Select the new data
plots.write = resample %>%

+   filter(!(PlotID %in% plots.sum$PlotID)) %>%
+   select(PlotID:Notes)

glimpse(plots.write)

Observations: 7
Variables: 3
$ PlotID        (fctr) D098, D104, D105, D605, D607, D608, D649
$ Re-sampleDate (time) 2015-10-14, 2015-09-29, 2015-09-30, 2015-10-16,
2015-10-15...
$ Notes         (fctr) NA, NA, NA, NA, NA, NA, NA

#+ AppendData ----
sqlSave(Summaries.DB, plots.write, "tblPlotsResampled", append = TRUE)

Error in sqlSave(Summaries.DB, plots.write, "tblPlotsResampled", append =
TRUE) :
  unable to append to table ?tblPlotsResampled?

Thanks,

MVS
=====
Matthew Van Scoyoc
=====
Think SNOW!