Error message displayed by AutoCAD
Error: ActiveX Server returned an error: Invalid index
Cause: The path to the folder that contains the plot
styles is not valid or the folder doesn't contain any plot styles.
Remedy: Verify path to plot styles is valid and contains
At the AutoCAD command prompt type: Preferences, pick the Files tab,
expand Printer Support File Path, expand Plot Style Table Search Path.
Here is the location of your plot styles.