plot_output.R I could not find the requsted var (or dimvar) in the file

RUN RScript plot_output.R
b325f4a25932:~# Rscript plot_output.R
Loading required package: ncdf4
[1] "vobjtovarid4: error #F: I could not find the requsted var (or dimvar) in the file!"
[1] "var (or dimvar) name: oxypom_DOxy"
[1] "file name: output.nc"
Error in vobjtovarid4(nc, varid, verbose = verbose, allowdimvar = TRUE) :
  Variable not found
Calls: t -> ncvar_get -> vobjtovarid4
Execution halted

This occurs with the gotm executable in the Docker