VEP Error On Some Files

I am facing this error while applying VEP, VEp was successfully running on different chromosome file of same database but on chr6 this error came,

File “/opt/conda/default/lib/python3.6/site-packages/hail/backend/spark_backend.py”, line 42, in deco
‘Error summary: %s’ % (deepest, full, hail.version, deepest)) from None
hail.utils.java.FatalError: HailException: VEP command ‘/vep --format vcf --json --everything --allele_number --no_stats --cache --offline --minimal --assembly GRCh38 --fasta /opt/vep/.vep/homo_sapiens/95_GRCh38/Homo_sapiens.GRCh38.dna.toplevel.fa.gz --plugin LoF,loftee_path:/opt/vep/Plugins/,gerp_bigwig:/opt/vep/.vep/gerp_conservation_scores.homo_sapiens.GRCh38.bw,human_ancestor_fa:/opt/vep/.vep/human_ancestor.fa.gz,conservation_file:/opt/vep/.vep/loftee.sql --dir_plugins /opt/vep/Plugins/ -o STDOUT’ failed with non-zero exit status 2
VEP Error output:
Smartmatch is experimental at /opt/vep/Plugins/de_novo_donor.pl line 175.
Smartmatch is experimental at /opt/vep/Plugins/de_novo_donor.pl line 214.
Smartmatch is experimental at /opt/vep/Plugins/splice_site_scan.pl line 191.
Smartmatch is experimental at /opt/vep/Plugins/splice_site_scan.pl line 194.
Smartmatch is experimental at /opt/vep/Plugins/splice_site_scan.pl line 238.
Smartmatch is experimental at /opt/vep/Plugins/splice_site_scan.pl line 241.
Can’t call method “feature” on an undefined value at /opt/vep/src/ensembl-vep/Bio/EnsEMBL/Variation/BaseVariationFeatureOverlapAllele.pm line 196.