Hello all, I was wondering if anyone could help me with interpreting this error message I got when I tried to run DEXSeq. I prepared the GTF file and performed exon counts on my BAM files before inputting them into DEXSeq, and ended up with this:

Fatal error: An undefined error occured, please check your input carefully and contact your administrator.
    converting counts to integer mode
    Warning message:
    In DESeqDataSet(rse, design, ignoreRank = TRUE) :
      some variables in design formula are characters, converting to factors
    using supplied model matrix
    using supplied model matrix
    using supplied model matrix
    Error in getListElement(x, i, ...) : 
      GRanges objects don't support [[, as.list(), lapply(), or unlist() at
      the moment
    Calls: DEXSeqHTML ... tryCatch -> tryCatchList -> tryCatchOne -> <Anonymous>