Please report your system info via Lightroom>Help>System Info...
If you encounter GPU driver issues while using ML features in LrClassic/LrD/ACR, please try to update to the latest macOS version or if you are on a Windows machine, follow https://helpx.adobe.com/lightroom-classic/kb/troubleshoot-gpu.html to update your machine to the latest GPU driver and see if the problem resolves itself.
If the OS or the driver is not available or possible and the problem persists, then try the following workaround method as a last resort. The method provides a mechanism to allow LrDesktop/LrClassic/ACR customers to force the ML inference to always run on CPU instead of default. See details here https://helpx.adobe.com/camera-raw/kb/acr-gpu-faq.html#lens-blur
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