Not_an_Entity.md

Error: Not an Entity {#error-not-an-entity}

A function cannot be executed as the item put into the function is not an entity.

To be considered an entity, the item must not be a list and must fall under one of the categories below:

• Position
• Objects (point, polyline, polygon)
• Topologies (vertex, edge, wire, face)
• Collection

###### Example 1 | Error Message | 
| | --- | --- | | Bug ✘ | Source of error: [coordinates](/chapter_2_geo-info_data_model/Position.md) are not entities.
| | Correction ✔ | Solution: make the coordinate into position entities.
|
###### Example 2 | Error Message | 
| | --- | --- | | Bug example ✘ | Source of error: `[cub_ex, cyl_ex]` contains 2 lists within a list, as both `cub_ex` and `cyl_ex` are [lists](/chapter_3_procedures/List.md) of polygons created by make.Extrude. The make.Collection function only accepts a single list of the [depth](/chapter_3_procedures/List.md) of 1.
| | Correction ✔ | Solution: Flatten the list `[cub_ex, cyl_ex]` to the depth of 1
|