How to use "Custom" Mesh size in Lua with CADFEKO

Hello 

I've been having a difficulty with meshing cubes, when I  run the command in lua script: 

 

project.Mesher.Settings.MeshSizeOption = cf.Enums.MeshSizeOptionEnum.Fine

 

The mesh that is generated doesn't have enough triangles, I tried to fix this by writing:

 

project.Mesher.Settings.MeshSizeOption = cf.Enums.MeshSizeOptionEnum.Custom
project.Mesher.Settings.TriangleEdgeLength = 0.2

 

but I get an error: 'Empty expression is not allowed for Edge size.
Error 16628: Error in expression at position 0 for expression: Edge size = ' 

 

How can I fix this error and set the triangle edge length to 0.2 using Lua?