GTF file not correct format or does not contain any exon feature

[ghost]

Hello,

Could you help me check why I am getting this error message?

I have verified the correct format of my GTF file and it does have exon features.

This is a sample of my gtf file:

TRINITY_GG_1_c0_g1 Trinity_gene exon 1 890 0 + . gene_id "TRINITY_GG_1_c0_g1"; transcript_id "TRINITY_GG_1_c0_g1_i1";

TRINITY_GG_1_c0_g2 Trinity_gene exon 1 680 0 + . gene_id "TRINITY_GG_1_c0_g2"; transcript_id "TRINITY_GG_1_c0_g2_i1";

TRINITY_GG_1_c0_g3 Trinity_gene exon 1 3214 0 + . gene_id "TRINITY_GG_1_c0_g3"; transcript_id "TRINITY_GG_1_c0_g3_i1";

TRINITY_GG_1_c0_g4 Trinity_gene exon 1 1847 0 + . gene_id "TRINITY_GG_1_c0_g4"; transcript_id "TRINITY_GG_1_c0_g4_i1";

TRINITY_GG_2_c0_g1 Trinity_gene exon 1 277 0 + . gene_id "TRINITY_GG_2_c0_g1"; transcript_id "TRINITY_GG_2_c0_g1_i1";

TRINITY_GG_2_c0_g2 Trinity_gene exon 1 1887 0 + . gene_id "TRINITY_GG_2_c0_g2"; transcript_id "TRINITY_GG_2_c0_g2_i1";

TRINITY_GG_3_c0_g1 Trinity_gene exon 1 307 0 + . gene_id "TRINITY_GG_3_c0_g1"; transcript_id "TRINITY_GG_3_c0_g1_i1";

TRINITY_GG_4_c0_g1 Trinity_gene exon 1 1951 0 + . gene_id "TRINITY_GG_4_c0_g1"; transcript_id "TRINITY_GG_4_c0_g1_i1";

TRINITY_GG_5_c0_g1 Trinity_gene exon 1 2366 0 + . gene_id "TRINITY_GG_5_c0_g1"; transcript_id "TRINITY_GG_5_c0_g1_i1";

TRINITY_GG_6_c0_g1 Trinity_gene exon 1 3319 0 + . gene_id "TRINITY_GG_6_c0_g1"; transcript_id "TRINITY_GG_6_c0_g1_i1";

TRINITY_GG_7_c0_g1 Trinity_gene exon 1 218 0 + . gene_id "TRINITY_GG_7_c0_g1"; transcript_id "TRINITY_GG_7_c0_g1_i1";

TRINITY_GG_7_c0_g2 Trinity_gene exon 1 1404 0 + . gene_id "TRINITY_GG_7_c0_g2"; transcript_id "TRINITY_GG_7_c0_g2_i1";

TRINITY_GG_7_c0_g3 Trinity_gene exon 1 874 0 + . gene_id "TRINITY_GG_7_c0_g3"; transcript_id "TRINITY_GG_7_c0_g3_i1";