vcf-merge error

[wang0430]

I'm sorry to trouble you！ when i use vcf-merge, the following error occurred
The reference prefixes do not agree: G vs A
Failed on line 1:1121794
at /data40T/wanggl/software/vcftools-vcftools-d511f46/bin/vcf-merge line 21, <ANONIO> line 58.
main::error('Failed on line 1:1121794\x{a}') called at /data40T/wanggl/software/vcftools-vcftools-d511f46/bin/vcf-merge line 355
main::merge_vcf_files('HASH(0x237aad0)') called at /data40T/wanggl/software/vcftools-vcftools-d511f46/bin/vcf-merge line 12