I don’t have the wp_cache plugin installed. Maybe akismet requires it on some web servers?
I asked my webhost about this. Here is their reply:
“Hi Fred,
I cannot see any technical reason why it wouldn’t function.
The error: Fatal error: Call to undefined function: wp_cache_get()
however means that the script cannot even find the function. So there is definitely a configurational or some other error in your script or implementation of wordpress or akismet.
Essentially your akismet.php script is trying to call a function wp_cache_get which should be defined somewhere in your code and included in the akismet.php file, it cannot find that function.
Thanks,
Webstrike Solutions
https://www.webstrikesolutions.com
[email protected]”