System call failed: Cannot allocate memory

https://travis-ci.com/github/c1au6i0/covid19census

Building fails while building vignette. Everything fine in local.
Any hint guys ?@jeroen and @jimhester

Thanks
Claudio

Same problem. Any solutions?

Looking at https://travis-ci.com/github/c1au6i0/covid19census/builds, the OP fixed it by fixing a bug in his program.