Source fails to install

[barracuda156]

Fails to install:

--->  Configuring R-ganalytics
Executing:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/ganalytics-0.10.7" && /opt/local/bin/R CMD build . --no-manual --no-build-vignettes --keep-empty-dirs 
* checking for file ‘./DESCRIPTION’ ... OK
* preparing ‘ganalytics’:
* checking DESCRIPTION meta-information ... OK
* checking for LF line-endings in source and make files and shell scripts
* checking for empty or unneeded directories
Omitted ‘LazyData’ from DESCRIPTION
* building ‘ganalytics_0.10.7.tar.gz’

--->  Building R-ganalytics
xinstall: mkdir /opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/build
Executing:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/ganalytics-0.10.7" && /opt/local/bin/R CMD INSTALL . --library=/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/build --install-tests 
* installing *source* package ‘ganalytics’ ...
** using staged installation
** R
** demo
** inst
** tests
** byte-compile and prepare package for lazy loading
in method for ‘coerce’ with signature ‘"gaSegmentSequenceFilter","json"’: no definition for class “json”
in method for ‘coerce’ with signature ‘"gaDynSegment","json"’: no definition for class “json”
in method for ‘coerce’ with signature ‘"gaDynSegment","json"’: no definition for class “json”
Error : in method for ‘SortBy’ with signature ‘object=".query"’:  arguments (‘desc’, ‘type’) after ‘...’ in the generic must appear in the method, in the same place at the end of the argument list
Error: unable to load R code in package ‘ganalytics’
Execution halted
ERROR: lazy loading failed for package ‘ganalytics’
* removing ‘/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/build/ganalytics’
Command failed:  cd "/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/ganalytics-0.10.7" && /opt/local/bin/R CMD INSTALL . --library=/opt/local/var/macports/build/_opt_PPCSnowLeopardPorts_R_R-ganalytics/R-ganalytics/work/build --install-tests 
Exit code: 1
Error: Failed to build R-ganalytics: command execution failed