Doubts about gff to gtf conversion

[z626093820]

When I use the gff.gff_to_gtf function it reports an error：

bellow is my gff

Ib01g1h maker gene 15818 17820 . + . ID=Ib01g1h00010;Name=Ib01g1h00010 Ib01g1h maker exon 15818 16247 . + 0 ID=Ib01g1h00010.1.exon.1;Parent=Ib01g1h00010.1 Ib01g1h maker exon 17604 17773 . + 2 ID=Ib01g1h00010.1.exon.2;Parent=Ib01g1h00010.1 Ib01g1h maker exon 17815 17820 . + 0 ID=Ib01g1h00010.1.exon.3;Parent=Ib01g1h00010.1 Ib01g1h maker CDS 15818 16247 . + 0 ID=Ib01g1h00010.1.CDS.1;Parent=Ib01g1h00010.1 Ib01g1h maker CDS 17604 17773 . + 2 ID=Ib01g1h00010.1.CDS.2;Parent=Ib01g1h00010.1 Ib01g1h maker CDS 17815 17820 . + 0 ID=Ib01g1h00010.1.CDS.3;Parent=Ib01g1h00010.1 Ib01g1h maker mRNA 15818 17820 . + . ID=Ib01g1h00010.1;Name=Ib01g1h00010.1;Parent=Ib01g1h00010 Ib01g1h maker gene 19878 20534 . + . ID=Ib01g1h00020;Name=Ib01g1h00020 Ib01g1h maker exon 19878 20534 . + 0 ID=Ib01g1h00020.1.exon.1;Parent=Ib01g1h00020.1 Ib01g1h maker CDS 19878 20534 . + 0 ID=Ib01g1h00020.1.CDS.1;Parent=Ib01g1h00020.1 Ib01g1h maker mRNA 19878 20534 . + . ID=Ib01g1h00020.1;Name=Ib01g1h00020.1;Parent=Ib01g1h00020