Error creating arrow file from fragment file - no valid Barcodes

[MJDelas]

I am getting an error when trying to create arrow files from fragment files I have been given.

Command (straight from the tutorial):
ArrowFiles <- createArrowFiles(
inputFiles = inputFiles,
sampleNames = names(inputFiles),
minTSS = 4, #Dont set this too high because you can always increase later
minFrags = 1000,
addTileMat = TRUE,
addGeneScoreMat = TRUE
)

Subset of the error:
2024-06-13 08:19:11.674659 : validBC, Class = NULL
validBC: length = 0 NULL

If I head the fragment file I can see the barcodes have the timepoint (metadata) added to them. See below.

chr1 3000061 3000290 E15_a_CTCACCAAGCTGAATA-1 1
chr1 3000064 3000294 E15_a_GCATTGACACCACCAG-1 1
chr1 3000076 3000286 E15_a_TACAGCATCCCAATGA-1 1
chr1 3000153 3000374 E15_a_TGCTTCGGTAGAATAC-1 1
chr1 3000184 3000314 E15_a_TAGCATGGTTACTACG-1 1
chr1 3000186 3000379 E15_a_ACCGGGTTCAGTTGAC-1 1
chr1 3000274 3000647 E15_a_GTGCACGCAGAAAGAG-1 3

1. Do we think that is why it cannot detect valid BC?
2. Is it somehow possible to still use this fragment files or do I have to delete the "E15_a_"?

Thanks a lot !!