Running EGRET 3.0.7 under R 4.1.3, with minNumObs = 1, minNumUncen = 1

Respected colleagues:
Running EGRET as described in the subject results in the following repetitive error, scrolling in the console immediately after completing estCrossVal();

"Error in y[, ny]: incorrect number of dimensions
Error"

Example (input data attached):
`remove(list = ls())
graphics.off()
library(EGRET)
cl4200 <- readRDS("eList_01054200_CL.rds")
cl4200 <- modelEstimation(cl4200, minNumObs = 1, minNumUncen = 1)
`
[eList_01054200_CL.zip](https://github.com/USGS-R/EGRET/files/9094779/eList_01054200_CL.zip)

Reproduce the report with R 4.1.3, EGRET 3.0.7, and the attached eList_01054200_CL data. Start at modelEstimation with minNumObs = 1 and minNumUncen = 1, then follow its estCrossVal path to the source of the dimension error. Done means the supplied example completes without the repetitive error.

Written by the indexing model from the issue text.