blank cooc.test.json file

[carlottaolivero]

Hi,
I was trying to use cojac for analysing SARS-CoV-2 sequenced wastewater samples.
When I was checking for co-occurrance using a standalone file,
(cojac) opentrons-b10@AirdiOptronsB10 cojac % cooc-mutbamscan -b QIAseqDIRECTSARSCoV2ampliconsfinal.bed -m voc/ -a read_mapping_21BL54986-TO_S3_L001.bam -j cooc-test.json

This message appears:

insertions not supported (yet): +ACT : ACT
insertions not supported (yet): +GAGCCAGAA : GAGCCAGAA
insertions not supported (yet): +AACA : AACA
autodecting reference as MN908947.3

and the cooc-test.json is empty:

What do you reckon is the problem here?
Many thanks for the help and for this amazing pipeline!!