Fiber segmentation

[AlexiaD33]

Hello!

I would like to do the segmentation on fibers. Everything worked well with the cell bodies but when i'm doing it just changing my seg images and my filter parmaeter keeping the same regis it doesn't work anymore and show me this error
Error in dataset$acronym[dataset$id > 0] <- as.character(acronym.from.id(dataset$id[dataset$id > : NAs are not allowed in subscripted assignments
I don't know why the id would be at 0 since it's the same regis and acronym than before (for the cell body). Also there is no missing values.

Please if you have any solutions