ShAndrei

I had the same problem. Need add file "manifest.json" in folder with custom component files. Home Assistant 0.94.4

I install Home Assistant 0.95.4. today on Rasberry Pi (Raspbian OS) and got the error described earlier: "2019-07-07 09:06:51 ERROR (MainThread) [homeassistant.components.homeassistant] Platform not found: sensor.clear_grass" Access rights:  Log:...

This did not help. Maybe the reason is how HA installing. Have you installed in virtual environment? I installed HA using this instruction https://www.home-assistant.io/docs/installation/raspberry-pi/.

The error occurs when i check the configuration file. Download passes without errors. 

Working now. When i added sensor: - platform: xiaomi_miio in configuration file, needed files was installed. Thanks for help.