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Could Not Get The AutoCAD Blocks Collection

 
This error is typically caused by an error in the Windows Registry with respect to AutoCAD's ActiveX interface.  The only way to fix this is to either repair or reinstall AutoCAD.  There have been a couple cases where it was a conflict with some other 3rd party software but 95% of the time this is a registry problem.
 

Typical Causes of AutoCAD Registry Errors

 

T

here are several things that can cause an error in the Windows Registry but the most common causes are:
 
  • You ran a registry cleaning software that removed some of the AutoCAD registry entries.  The AutoCAD installation Read
  • You are running multiple versions of AutoCAD on your computer.  If you are running multiple versions it is HIGHLY RECOMMENDED that you always run in Power User or Administrator mode so AutoCAD can properly write to the registry. When running as a Normal User or Restricted User you may not be able to write to the HKEY_LOCAL_MACHINE portion of the registry and hence AutoCAD may not be able to properly update the registry values when you switch between the different version.  To make matters worse Windows only has one "AutoCAD.Application" object in the registry and this will point to the current version that was used last. So it may point to:
 
  • "AutoCAD.Application.15" = AutoCAD 2000, AutoCAD 2000i, or AutoCAD 2002
  • "AutoCAD.Application.16" = AutoCAD 2004
  • "AutoCAD.Application.16.1" = AutoCAD 2005
  • "AutoCAD.Application.16.2" = AutoCAD 2006
 
     Then add to that the fact that ADT, MDT, LDDT, and AutoCAD are all really considered "AutoCAD.Application".
 
  • You uninstalled an older version of AutoCAD after installing the newer version.  This is why Autodesk recommends uninstalling the old version first before installing the new version.  Essentially the old version was never designed to check for the new version and hence it may uninstall registry keys or files that the new version needs.
 
 

Why you shouldn't run more than one version of AutoCAD on a computer

 
  • The most important reason is that it is illegal if you purchased an upgrade to keep the old version installed past 120 days.  Read the License.rtf in the AutoCAD folder if you don't believe me.  Legally you are just as liable as having a license that you did not pay for after the 120 day period.  Now we haven't heard of Autodesk even enforcing it but if you do get audited you could end up paying a heathy sum of money.
  • In the case of AutoCAD 2004-2006 the file formats are essentially the same and all files created in 2006 should open perfectly fine in 2004.  So it makes very little sense to have both installed at the same time unless you have custom programs that do not run in the newer version.
 

How to Fix the Registry in AutoCAD 2004 - 2006

 
Please search the AutoCAD help for "Reinstall or Repair AutoCAD" and follow the steps there.  Basically you are going to want to be logged in as the "Administrator" on your computer and either insert the original installation CD or use the Control Panel - Add or Remove Programs to Reinstall or Repair the installation.  Then select the Repair Option and then the Repair Registry.
 
 
 
 
 
How To Fix The Registry In AutoCAD 2000 - 2002
1.
Check the AutoCAD help but basically you are stuck reinstalling AutoCAD because they didn't have the registry repair option until AutoCAD 2004.