By must be installed for pthread_cancel to work

If you ever see the error “ must be installed for pthread_cancel to work” for cPanel, this is most likely due to cPanel running out of memory.

You can check the current memory being used by running the command free -tm, you should see an output like the one below:

total used free shared buffers cached

Mem: 1850 1172 677 0 43 559
-/+ buffers/cache: 569 1280
Swap: 2047 0 2047
Total: 3898 1172 2725

To increase the memory limit for cPanel, go to Tweak Settings (in WHM) then search for “Max cPanel process memory”, you can then increase this to say 512MB from the default 256M, then click on Save.

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