Major Inventor Problem

[Chris Dibble]

I've been using Inventor to design the robot, and am nearly finished. But recently, I've gotten an error which does not let me save! Here it is:

[WARNING] Problems encountered while saving the document. <FwRes.dll(1806)> [r:\core\Fw\Main\FWxSceneDoc.cpp, line 1431]
[ERROR] Error(s) detected while writing segment AmDcSegment in database C:\Documents and Settings\Dibble\My Documents\Chris\Activities\Robotics\Inventor\Robot \Robot Built Frame CTD2.iam <RSeRes(622)> [r:\core\RSe\segment\segStream.cpp, line 242]
[ERROR] Error detected while saving object of type RDxOccurrence <RSeRes(1408)> [r:\core\RSe\meta\meta.cpp, line 967]
[ERROR] Internal error in persistence operation (Segment loading is not supported within other persistence operations) <RSeRes(623)>
[ERROR] The database in C:\Documents and Settings\Dibble\My Documents\Chris\Activities\Robotics\Inventor\Robot \Robot Built Frame CTD2.iam could not be saved <RSeRes(202)> [r:\core\RSe\database\databaseC.cpp, line 1195]

Does anyone know why this is happening? I'm running on a 2ghz machine with 512mb ram, so it shouldn't be processor speed.

Please help if you can, I'll greatly appreciate it.

Thanks,
Chris