Very often, the error message includes c0000005, which is an "Access Violation." This means vl.crx tried to read or write to a memory address that was either protected or no longer exists. Causes include:
Set DEMANDLOAD to 2 or 3 to allow automatic loading of ARX/CRX files: autocad exception in vl.crx arx command
DEMANDLOAD = 2
Seek official support if: