AutoCAD Inventor :: Program Automatically Terminated / Send Error Report - Appears

Our team is doing program customization in Inventor 2011 that extract drawings based on 3D model. When the program runs and reached the line that has either open, close and save method, Inventor program automatically terminated and “Inventor Send Error Report” appears. When we tried to debug the program and when it reached the line that has either open, close, and save method, we force to exit our customized program but the same case, when it is totally terminated, Inventor program also terminated and “Inventor Send Error Report” appears. When we investigate the problem, we tried several solutions such as setting the active document to new variable, added a method to pause the program for few seconds, etc but still no effect. Our machine is using: Windows XP Pro x64 SP2 Intel Xeon(R), 6 GB RAM Is there a VBA for Inventor that is intended for 64 bit machine? Because I think we use 32 bit VBA in Inventor. What does “Inventor32bitHost.exe” means in task manager? Is there any relation to Inventor VBA?