same start and end position

I am a new user. I performed targeted bisulfite sequencing on 2 groups of samples and subsequently analyzed the data with Methylkit in R. My output file is a list of CpGs significantly differentially methylated between the 2 groups, with the 3 columns as requested by the EpiExplorer program (chr, start, end). My data is at single CpG level, thus start and end positions are exactly the same. This gives an error when uploading the file: "

Error: Invalid format at line 0. chromosome end(843641) should be larger than chromosome start (843641)"