What does this error mean? Which matrix is the system matrix and why would singularity be a problem? If it helps, here is my input file: http://pastebin.com/ite3C1Vz -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://list.coin-or.org/pipermail/csdp/attachments/20141204/2ca7c813/attachment.html>