Fix Non-Coplanar Line in AutoCAD

[feruizv]

I'm trying to either fillet or extend/trim a line and it keeps telling me that the items are non coplanar. What do I need to do for this not to happen?

 

[Nicklogan]

It's likely that the drawing entities you are trying to connect are either on different layers or are in different z axis planes. Use your layer editor to check or type "list" on the command line, choose the entities in question, and hit "enter". Check the attributes of each entity.