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AutoCAD Based 3D Modeling (Ribbon/Toolbar/Location)
Description:
Trying to use the S3D command/raising to 3D gives this error, possibly due to sensitive layers being locked or frozen.
Verify layer 0 is unlocked and thawed before creating a system model. [Thanks Alex O]
Examples of sensitive layers which should not be locked or frozen but not limted to these;
0, DEFPOINTS, HANGERS, HYD, SPRKDAT3, STEEL5
Running AUDIT and PURGE won't hurt either