Hi, I came across an error when building the TxDb from GFF as follow:

txdb <- makeTxDbFromGFF(gfffile, format="gff")

Import genomic features from the file as a GRanges object ... OK

Prepare the 'metadata' data frame ... OK

Make the TxDb object ... Error in .get_cds_IDX(type, phase) : 

 the "phase" metadata column must contain 0, 1, or 2, for all the CDS features

Thanks for your suggestions.