Hi there,
it seems the driver is not installed correctly. please try to reinstall the driver again. Please post the installation log to us.
You also can change the source location by editing /etc/apt/sources.list, select your nearest source.
For the 6 mics pi hat, please also check the 1-wire setting, Please click raspberry -> Preferences -> Raspberry Pi Configuration, then select the Interfaces tab, make sure the 1-Wire is Disabled. thanks.
sudo apt-get update
sudo apt-get upgrade
git clone https://github.com/respeaker/seeed-voicecard.git
cd seeed-voicecard
sudo ./uninstall.sh
reboot
sudo ./install.sh
reboot