Thank you! It helped! I’ve searched in the following directories:
Mac HD / Applications /
Mac HD / Users / / Library / Preferences /*
Mac HD / Library / Audio / Plug-ins / VST /
Mac HD / Library / Audio / Plug-ins / VST3 / Steinberg /
Mac HD / Library / Audio / Plug-ins / Components /
Mac HD / Library / Application Support / Steinberg /
Mac HD / Library / Application Support / Steinberg / Content / VST Sound / **
Mac HD / Library / Application Support / Steinberg / Content / Halion / VST Sound / **
And found these files:
ADD_SMT_114_Dark_Planet.vstsound
ADD_SMT_115_Dark_Planet_Presets.vstsound
Dark Planet.pdf
Dark Planet.cfg
Dark Planet.component
After removing these, the error message is gone.
Thanks!