I receive the following error when I try to create a txdb from a gff file that I imported into GRanges:

> GenomicFeatures::makeTxDbFromGRanges(test)
Error in .get_cds_IDX(type, phase) :
  the "phase" metadata column must contain 0, 1, or 2, for all the CDS features

However, when I check the GRanges object, everything seems to be in order:

> cds <- which(test$type == 'CDS')
> table(test[cds]$phase)

    0
12519
> which(test[cds]$phase != 0)
integer(0)

Can someone point in me the right direction what I am missing here? Thanks!