You have to revert the modpack back to Version 9.1.7a,
- Open Technic And Go To Pixelmon Ultra
- Click "Modpack Options"
- Where it Says "Select Version" Click "Specific Version"
- Open Dropdown bar and Click 9.1.7a Then Reinstall the pack
After That you Should be good to go
Canvas Gaming Ltd and the AnubisMC server are in no way affiliated with Mojang, AB. Nor should it be considered a company endorsed by Mojang, AB. Any purchase made on this store goes to Canvas Gaming Ltd.