When working in AutoCAD, you receive the following error:
License error. Your license is invalid. Please contact your local authorised AutoCAD dealer.
This may be followed in some cases by an additional error:
Unhandled e06d7363h Exception at 7c812a5bh.
Causes: The "License is invalid" and the "Unhandled e06d7363h Exception at 7c812a5bh" are common errors that result from out-of-memory scenarios. If the memory footprint for
acad.exe goes over 2 GB (regardless of how much memory is in the system) Windows will terminate it. This is a limitation of 32-bit computing.
In the Task Manager, you will often see the memory usage for
acad.exe between 1.2 and 1.8 GB during these crashes because there is a lag in the memory reports from the Task Manager. In 32-bit operating systems, AutoCAD (and other applications) are limited to 2 GB of total memory usage, regardless of how much memory the machine has.
The amount of memory that can be allocated to AutoCAD and other applications can be increased to 3 GB by implementing the 3 GB switch in Windows. See
Enabling the 3GB switch on Windows Vista, Windows 7 and Windows XP
In a 32-bit environment, this is as much memory as can be allocated to AutoCAD, so if the memory use exceeds the expanded 3 GB memory limitation, you may need to consider moving to a 64-bit environment. In a 64-bit system, the memory allocation has been increased dramatically and out-of-memory scenarios will be uncommon.