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100 Unknown raw reads

Dear Metaphlan2 team,

When I use metaphlan2 on raw illumina reads, I have the following results.

#mpa_v296_CHOCOPhlAn_201901.
#/opt/miniconda/bin/metaphlan2.py P1030_R1.paired.fastq --input_type fastq --nproc 15 --bowtie2db bowtie2db/mpa --mpa_pkl mpa_v296_CHOCOPhlAn_201901.pkl --unknown_estimation.
#SampleID Metaphlan2_Analysis.
#clade_name NCBI_tax_id relative_abundance.
UNKNOWN -1 100.0.

metaphlan2 semis to work on example dataset (see below), but I found strange to found 100 Unknown. Did I miss something or do something wrong ?

On an example provided in Bitbucket :
#mpa_v296_CHOCOPhlAn_201901
#/opt/miniconda/bin/metaphlan2.py SRS014476-Supragingival_plaque.fasta --input_type fasta --nproc 15 --bowtie2db bowtie2db/mpa --mpa_pkl mpa_v296_CHOCOPhlAn_201901.pkl
#SampleID Metaphlan2_Analysis
#clade_name NCBI_tax_id relative_abundance
k__Bacteria 2 100.0
k__Bacteria|p__Actinobacteria 2|201174 100.0
k__Bacteria|p__Actinobacteria|c__Actinobacteria 2|201174|1760 100.0
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Corynebacteriales 2|201174|1760|85007 65.25681
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales 2|201174|1760|85006 34.74319
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Corynebacteriales|f__Corynebacteriaceae 2|201174|1760|85007|1653 65.25681
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae 2|201174|1760|85006|1268 34.74319
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Corynebacteriales|f__Corynebacteriaceae|g__Corynebacterium 2|201174|1760|85007|1653|1716 65.25681
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia 2|201174|1760|85006|1268|32207 34.74319
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Corynebacteriales|f__Corynebacteriaceae|g__Corynebacterium|s__Corynebacterium_matruchotii 2|201174|1760|85007|1653|1716|43768 65.25681
k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_dentocariosa 2|201174|1760|85006|1268|32207|2047 34.74319
#Additional species represented by this clade: k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC071F11,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC069C01,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC08A08,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC036D11,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC067H10,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC065D02,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC058E10,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC065G12,k__Bacteria|p__Actinobacteria|c__Actinobacteria|o__Micrococcales|f__Micrococcaceae|g__Rothia|s__Rothia_sp_HMSC064D08