Hi Peter,

I did try it without the mask and continue to get the same error. As for R, I am using version 3.2.0 (2015-04-16).

When I run 3dMVM this is the output regarding the R packages. It looks to me that everything is installing correctly, but please let me know if you see something odd:

Loading required package: afex
Loading required package: lme4
Loading required package: Matrix
Loading required package: reshape2
Loading required package: lsmeans
Loading required package: estimability

Attaching package: ‘lsmeans’

The following object is masked from ‘package:base’:

rbind

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Welcome to afex. Important changes in the current version:
- Functions for ANOVAs have been renamed to: aov_car(), aov_ez(), and aov_4().
- ANOVA functions return an object of class 'afex_aov' as default, see: ?aov_car
- 'afex_aov' objects can be passed to lsmeans for contrasts and follow-up tests.
- Reset previous (faster) behavior via: afex_options(return_aov='nice')
- Many more arguments can now be set globally via options, see: afex_options()
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Package afex loaded successfully!

Loading required package: phia
Loading required package: car
Package phia loaded successfully!