If that doesn't help, please copy/paste here the entire contents of the LR menu command Help > System Info -- that will let us see exactly which versions of hardware and software LR thinks you're running.
I have a Dell XPS 15 with NVIDIA GeForce GTX 1650 Ti - also with just 4GB RAM. That is half of what Adobe recommends for this denoising operation, but I have had no problems so far (except it is slower than my desktop PC).
Install the GeForce Experience utility to make sure you always have the latest graphics drivers installed.
Check your Windows "Power Mode" settings. My Lenovo P53s laptop had this same error when the power mode was on "Best power efficiency". Changing the power mode to "Balanced" resolved the error. I believed Windows was disabling the discrete GPU that Lightroom was actively using due to that power setting. Hence the error.
Once more a case of conflicting dual GPUs. This is a very well known problem with Photoshop on laptops, not so much discussed with Lightroom.
But the underlying problem is the same. The GPU is used for actual data processing, it's not just a simple downstream flow as it is in most simpler consumer applications. You can't send data to one GPU and get it back from the other.
The standard advice in Photoshop when this happens, is to go into the OS and completely disable the integrated GPU.
Disablng the integrated GPU is heavy handed. That can have unintended consequences for laptop users that are detrimental in other ways. Running the discrete GPU continuously when not needed can create heat issues which will force CPU and GPU throttling below the OS layer by the BIOS. Where the option exists, as it does with most laptops, at least trying to use power settings to effectively manage GPU utilization is a more surgical and stable approach. Disabling the embedded GPU should be the last resort.
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