TCPS-802 — There is not place for storing state of a new process
A block shared memory (called "the scoreboard") is used for communication between the parent process and its children. Each child process occupies one element (slot) in the scoreboard. Normaly, there are MAX-CHILDREN slots, therefore scoreboard space should be never exhausted. This message means that state of some finished process has not been properly cleared. A new process cannot be created, because there is no free slot for storing its state.