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How to stop this attached message.


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You will need to fix the drawing.


From Autodesk.....




When opening a DWG file in AutoCAD or inserting an external file as a block or external reference, one of the following messages is displayed:
This application has detected a mixed version of AEC objects participating in this operation.


Failed to register DWS file support for eTransmit Loading AEC Base Extended.


There are several potentail causes:
  • Drawing was saved from a different version (usually newer) of AutoCAD.
  • An appropriate object enabler is not installed to support the AEC objects.
  • Files are being opened between Architectural Desktop and AutoCAD, or between AutoCAD Land Desktop versions. 


Do one of the following:
  • Use the -EXPORTTOAUTOCAD command (or AECTOACAD) to resave the file.
  • Install the needed object enabler.
  • Open the file in the newer version of AutoCAD which last saved it.
  • Use AutoCAD Architecture to open Architectural Desktop files, or revert to Architectural Desktop itself.
  • In AutoCAD Land Desktop, use the Format/Explode setting in the Civil Batch Drawing Converter utility to resave the file.


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