distToNearest errors

Following the distToNearest vignette, I tried the following:

> file <- system.file("extdata", "Influenza.tab", package="shm")
> db <- readChangeoDb(file)
> dim(db)
[1] 1359   35
> dist_m1n <- distToNearest(db, model="m1n", first=FALSE, normalize="length")
Warning messages:
1: In db$V == g :
  longer object length is not a multiple of shorter object length
2: In db$V == g :
  longer object length is not a multiple of shorter object length
3: In db$V == g :
  longer object length is not a multiple of shorter object length
4: In setup_parallel() : No parallel backend registered
5: <anonymous>: ... may be used in an incorrect context: ‘.fun(piece, ...)’
6: <anonymous>: ... may be used in an incorrect context: ‘.fun(piece, ...)’

I understand that error4 might be related to our cluster, but the rest seem to be independent ? I also tried another small sample dataset, and got the same errors, as well as a similar one:

8: In db$J == g : longer object length is not a multiple of shorter object length

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