How do I clear the cache on my PS4 to potentially fix the error?

While not a direct fix, clearing the cache can sometimes help. You can do this by rebuilding the PS4's database. Go to Settings > Devices > Remotes Connection Settings > Use Wireless Connection. Then, turn off your PS4 completely. Hold the power button until you hear two beeps (about 7 seconds) to enter Safe Mode. Select 'Rebuild Database' (this takes a while).