Move one of the objects a very tiny amount (e.g., 0.001 units) so their faces no longer perfectly overlap. This often clears the mathematical bottleneck. Run SOLIDCHECK: Set the system variable SOLIDCHECK
It indicates a failure in the ACIS modeling engine (ASM) to process the geometry, often due to corrupted solids or non-manifold geometry Primary Causes Non-Solid Objects autocad error 18003
is almost always a permission or corruption issue within the FlexNet licensing framework. In 80% of cases, simply deleting the FLEXnet folder (Method 1) and running as Administrator (Method 2) resolves it instantly. For persistent cases, service restarts and antivirus exclusions are next-line solutions. Rarely, a clean OS user profile or full reinstall becomes necessary. Move one of the objects a very tiny amount (e