argument "lower" is missing

[kaurao]

I really like this package and have been using it for a project where the data is very high dimensional (~56,000). I get the following error randomly but never in the first/initial generation:

Error in assertNumeric(lower, any.missing = FALSE, all.missing = FALSE) :
argument "lower" is missing, with no default

Any clue what might be happening?

The examples from the documentation work without errors.

PS: also tried using the ecr2 package but still get the same error there.