error uploading gff

[Gon1976]

Hi, I just download seqplot and try to upload a gff file, I have the error "file processing error":
my gff is gff2 formated:
tig00000003_pilon_pilon AUGUSTUS gene 49 414 0.82 + 1 ID=g1.t1
tig00000003_pilon_pilon AUGUSTUS gene 1631 2707 0.95 + 3 ID=g2.t1
tig00000003_pilon_pilon AUGUSTUS gene 7148 8191 1 - 1 ID=g3.t1

tab separated with 9 columns.