После скачивания probuilder ver 5.0.6 на unity появляется ошибка CS0246,CS0234. Как исправить?

Library\PackageCache\[email protected]\Editor\MenuActions\Export\Export.cs(5,30): error CS0234: The type or namespace name 'Stl' does not exist in the namespace 'UnityEngine.ProBuilder' (are you missing an assembly reference?)

Library\PackageCache\[email protected]\Editor\MenuActions\Export\ExportStlAscii.cs(7,30): error CS0234: The type or namespace name 'Stl' does not exist in the namespace 'UnityEngine.ProBuilder' (are you missing an assembly reference?)

Library\PackageCache\[email protected]\Editor\MenuActions\Export\Export.cs(42,14): error CS0246: The type or namespace name 'FileType' could not be found (are you missing a using directive or an assembly reference?)

Library\PackageCache\[email protected]\Editor\MenuActions\Export\ExportStlAscii.cs(49,77): error CS0246: The type or namespace name 'FileType' could not be found (are you missing a using directive or an assembly reference?)