Travis error installing devtools due to R 3.5

[mattdowle]

Last master check here fails with :

Error: package ‘devtools’ was installed by an R version with different internals; it needs to be reinstalled for use with this R version
Execution halted

@jimhester aware and fixed yesterday already (thanks!) :
travis-ci/travis-build@b78ea1c
So I'm not sure why we're seeing a fail today. Is each commit to Travis-build master immediately used by R packages on GitHub using Travis (I thought so)? Or maybe the attempted fix doesn't quite work, needs time to update cache, or we need to change something in our travis.yml (e.g. should we remove cache: packages, and then put it back to force the update of the cache perhaps)?

For now, I'll proceed to merge PRs with Travis on GitHub in error status. AppVeyor is passing and enough to proceed.

[mattdowle]

Lucky me! Workaround worked.

[elcega]

Hi,

I am having the same issue as initially posted.

Could you explain in a bit more detail what did you do to re-install or make data.table work on R 3.5?

Thanks,

Elena

[jangorecki]

@elcega all Matt did is explained in git history, see .travis.yml file in 3deeb38