Thank you! "Caused by: java.lang.NegativeArraySizeException" your system is not making sense, this happens with the ProBas database unfortunately that you seem to use (from the screenshot), also for products directly in the database (not our fault, this is the database as is published). You should not create a system with autoconnect but build it manually with this database. Or, if you have a very small system (e.g. 4 processes), and really large processes, then 1.10.3 has a bug and cannot calculate, this was fixed in 1.11. Good luck!