octopus keeps crashing for OutOfRangeException

Hi everyone.

I am having a problem with octopus .

I have 3 objectives calculated by EnergyPlus and Daysim. Everything goes well at first; but after several generations it will crash and generate an errorlog which showes "Error: Index was out of range. Must be non-negative and less than the size of the collection." However, all the numbers are normal.

Thanks for any advice.

Best Regards,

Yi