ABSOLUTE - maf format

Hi,

I'm trying to run Absolute with a .maf file. I get the following message...

> RunAbsolute("out2.file", 0, 0.02, 0.95, 10, "CLL", "Illumina_WES", "sample1", "./ABSOLUTE_OUTPUT", 10000, 0, 0, "total", maf.fn="./MAF_FILE/output.somatic.maf", min.mut.af=0.1, output.fn.base="sample1", verbose=TRUE)
[1] "Capping 8 segs at tCR = 5.0"
[1] "Expected copy-ratio = 0.91737"
Error in CreateMutCnDat(maf, seg.dat, min.mut.af, verbose = verbose) :
Malformed MAF file, no ref column supplied
Calls: RunAbsolute -> CreateMutCnDat
In addition: Warning message:
In MakeSegObj(seg.dat.fn, min_probes = min_probes, max_sd = max_sd, :
NAs introduced by coercion
Execution halted

I don't understand the problem with the MAF file. I have the "Reference_Allele" column as shown below.

Any ideas? Thanks. Jane

Hugo_Symbol Entrez_Gene_Id Center NCBI_Build Chromosome Start_position End_position Strand Variant_Classification Variant_Type Reference_Allele Tumor_Seq_Allele Tumor_Seq_Allele2 dbSNP_RS dbSNP_Val_Status Tumor_Sample_Barcode Matched_Norm_Sample_Barcode Match_Norm_Seq_Allele1 Match_Norm_Seq_Allele2 Tumor_Validation_Allele1 Tumor_Validation_Allele2 Match_Norm_Validation_Allele1 Match_Norm_Validation_Allele2 Verification_Status Validation_StatusMutation_Status Sequencing_Phase Sequence_Source Validation_Method Score BAM_file Sequencer Genome_Change Annotation_Transcript Transcript_StrandTranscript_Exon Transcript_Position cDNA_Change Codon_Change Protein_Change
CAPRIN2 65981 broad.mit.edu 37 12 30888001 30888001 + Missense_Mutation SNP T C C rs12146709 byFrequency;by1000genomes Tumor Normal g.chr12:30888001T>C uc001rji.1- 4 1461 c.710A>G c.(709-711)AAA>AGA p.K237R
BCL6B 255877 broad.mit.edu 37 17 6928019 6928020 + In_Frame_Ins INS - CAG CAG rs146207245;rs72254884 by1000genomes Tumor Normal g.chr17:6928019_6928020insCAG uc002geg.2 + 4 758_759 c.701_702insCAG c.(700-702)TCC>TCCAGC p.234_234S>SS
WASL 8976 broad.mit.edu 37 7 123388732 123388732 + Silent SNP G A A rs62472101 byFrequency;by1000genomes Tumor Normal g.chr7:123388732G>A uc003vkz.2 -1385 c.57C>T c.(55-57)TCC>TCT p.S19S