Launching SU 2020 throws the following error , randomly after using SU 2021.
Error: #<Gem::MissingSpecError: Gem::MissingSpecError>
C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/dependency.rb:310:in to_specs' C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/specification.rb:1469:in block in activate_dependencies’
C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/specification.rb:1458:in each' C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/specification.rb:1458:in activate_dependencies’
C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/specification.rb:1440:in activate' C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems.rb:224:in rescue in try_activate’
C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems.rb:217:in try_activate' C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/core_ext/kernel_require.rb:128:in rescue in require’
C:/Program Files/SketchUp/SketchUp 2020/Tools/RubyStdLib/rubygems/core_ext/kernel_require.rb:39:in `require’
Please suggest a solution.