This works for me...

[ldecicco-USGS]

Ignore the indentation changes (not sure where those came from).....the main thing is getting rid of the "WREG", in the navbarPage.

devtools::session_info()
Session info ---------------------------------------------------------------
 setting  value                       
 version  R version 3.5.1 (2018-07-02)
 system   i386, mingw32               
 ui       RStudio (1.1.456)           
 language (EN)                        
 collate  English_United States.1252  
 tz       America/Chicago             
 date     2018-08-13                  

Packages -------------------------------------------------------------------
 package     * version date       source        
 backports     1.1.2   2017-12-13 CRAN (R 3.5.0)
 base        * 3.5.1   2018-07-02 local         
 Cairo         1.5-9   2015-09-26 CRAN (R 3.5.0)
 compiler      3.5.1   2018-07-02 local         
 crosstalk     1.0.0   2016-12-21 CRAN (R 3.5.0)
 datasets    * 3.5.1   2018-07-02 local         
 devtools      1.13.6  2018-06-27 CRAN (R 3.5.0)
 digest        0.6.15  2018-01-28 CRAN (R 3.5.0)
 DT          * 0.4     2018-01-30 CRAN (R 3.5.0)
 evaluate      0.11    2018-07-17 CRAN (R 3.5.1)
 graphics    * 3.5.1   2018-07-02 local         
 grDevices   * 3.5.1   2018-07-02 local         
 htmltools     0.3.6   2017-04-28 CRAN (R 3.5.0)
 htmlwidgets   1.2     2018-04-19 CRAN (R 3.5.0)
 httpuv        1.4.5   2018-07-19 CRAN (R 3.5.1)
 jsonlite      1.5     2017-06-01 CRAN (R 3.5.0)
 knitr         1.20    2018-02-20 CRAN (R 3.5.1)
 later         0.7.3   2018-06-08 CRAN (R 3.5.0)
 magrittr      1.5     2014-11-22 CRAN (R 3.5.0)
 memoise       1.1.0   2017-04-21 CRAN (R 3.5.0)
 methods     * 3.5.1   2018-07-02 local         
 mime          0.5     2016-07-07 CRAN (R 3.5.0)
 promises      1.0.1   2018-04-13 CRAN (R 3.5.0)
 R6            2.2.2   2017-06-17 CRAN (R 3.5.0)
 Rcpp          0.12.18 2018-07-23 CRAN (R 3.5.1)
 rlang         0.2.1   2018-05-30 CRAN (R 3.5.0)
 rmarkdown   * 1.10    2018-06-11 CRAN (R 3.5.0)
 rprojroot     1.3-2   2018-01-03 CRAN (R 3.5.0)
 shiny       * 1.1.0   2018-05-17 CRAN (R 3.5.1)
 stats       * 3.5.1   2018-07-02 local         
 stringi       1.1.7   2018-03-12 CRAN (R 3.5.0)
 stringr       1.3.1   2018-05-10 CRAN (R 3.5.0)
 tools         3.5.1   2018-07-02 local         
 utils       * 3.5.1   2018-07-02 local         
 withr         2.1.2   2018-03-15 CRAN (R 3.5.0)
 WREG        * 2.02    2018-08-13 local         
 xtable        1.8-2   2016-02-05 CRAN (R 3.5.0)
 yaml          2.2.0   2018-07-25 CRAN (R 3.5.1)