What version of Linux is that? If the kernel is 4.15 as the log suggests, that is a couple of years obsolete. You really should be using something modern like Ubuntu 18.04/20.04, Debian 9/10, or Mint 19/20.
The error occurs when attempting to pull data for a spawned entity, which it apparently had no issue with previously, but now is unable to. Initial thoughts are insufficient resources, or corruption in the data.