Grid Tool Install Error

I downloaded the Grid Extension from the Warehouse (version 1.1.2). I install it with no errors during installation and it does not appear in Tools. On exit and restart I get this error: Any help would be appreciated. Thanks. (SUPro V 21.1.299)

Error Loading File C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid/grid.rb
Error: #<NameError: uninitialized constant UI::Comamnd
Did you mean? UI::Command>
C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid/grid.rb:358:in <module:Grid>' C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid/grid.rb:29:in <top (required)>’
C:/Program Files/SketchUp/SketchUp 2021/Tools/extensions.rb:197:in require' C:/Program Files/SketchUp/SketchUp 2021/Tools/extensions.rb:197:in load’
C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid.rb:36:in register_extension' C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid.rb:36:in module:Grid
C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid.rb:26:in <module:Samples>' C:/Users/na/AppData/Roaming/SketchUp/SketchUp 2021/SketchUp/Plugins/su_grid.rb:25:in <top (required)>’

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