ERROR: loading failed for 'i386' on windows

[DejanDraschkow]

first of all - amazing work! thanks!

I am getting into trouble when trying to install the package on two different windows machines (iOS works perfectly well).

Error: loading failed
Execution halted
*** arch - x64
Importing MNE version=0.17.dev0, path='C:\Users\Public\ANACON~1\lib\site-packages\mne'
ERROR: loading failed for 'i386'

this is in response to devtools::install_github("mne-tools/mne-r")

I am trying to troubleshoot this at the moment, but maybe somebody has an idea?
It seems to be defaulting to the wrong python version during installation.

thanks,
dejan

[dengemann]

@DejanDraschkow the question is what exactly fails. Can you import mne inside python? Could it be that you use a 32 bit version of R? Perhaps update the R installation. This is what apparently worked for @craddm.

[craddm]

@DejanDraschkow the problem, I think, is that if both 32-bit and 64-bit versions of R are installed, devtools tries to build for both of them. During the build process, it checks if the newly built package can be loaded under both 32-bit and 64-bit R versions. When it tries running the 32-bit version, the reticulate package causes an error if the version of Python it has access to is 64-bit, so the install process fails. I think the key part of the update which spared me this problem was not installing the 32-bit version of R, as now devtools only builds for 64-bit.

Rather than having to update R, you can add INSTALL_opts=c("--no-multiarch") to your install_github() call:
devtools::install_github("mne-tools/mne-r", INSTALL_opts=c("--no-multiarch"))

This should force it to only build the package for your currently running R version.

edit: Actually, I suspect this might also happen because reticulate is loaded by the mne-r package itself using library(reticulate) , which it shouldn't be

[DejanDraschkow]

perfect, this worked :)
and yes, the issue might be connected to loading reticulate in the package

[dengemann]

This looks like something we should document in the troubleshooting section here https://mne-tools.github.io/mne-r/index.html#troubleshooting-and-known-issues-