If you have a supported graphics card, you can go to the Preferences of Photoshop, then Performance & ensure that the option to Use graphics processor is enabled. Also, click on Advanced Settings & ensure that you have Use OpenCL enabled.
It pretty much means what it says - either your system does not support the necessary hardware acceleration functions or your graphics driver is misconfigured. Impossible to know without actual system info at hand. Start by checking the relevant preferences and update your system's graphics driver if necessary.