Input string was not in the correct format
  at System.UInt64.Parse (System.String s, NumberStyles style, IFormatProvider fp) [0x00016] in /var/tmp/portage/dev-lang/mono-1.2.3/work/mono-1.2.3/mcs/class/corlib/System/UInt64.cs:343
  at System.UInt64.Parse (System.String s) [0x00000] in /var/tmp/portage/dev-lang/mono-1.2.3/work/mono-1.2.3/mcs/class/corlib/System/UInt64.cs:97
  at System.Convert.ToUInt64 (System.String value) [0x00009] in /var/tmp/portage/dev-lang/mono-1.2.3/work/mono-1.2.3/mcs/class/corlib/System/Convert.cs:2374
  at OpenSim.GridManager.LoadGrid () [0x00000]