No structure encoding found for CGRect
i am trying the example code in the run script window. but this error happends.

`Error: An Obj-C exception occurred.
    at [native code] (/)
    at value (/Applications/Sketch.app/Contents/Resources/SketchAPI.js:1:13803)
    at r (/Applications/Sketch.app/Contents/Resources/SketchAPI.js:1:29224)
    at onRun (/Users/aliasjad/Library/Application Support/com.bohemiancoding.sketch3/Plugins/Untitled.sketchplugin:12:22)
  nativeException: No structure encoding found for CGRect
Script executed in 0.039289s`