This message can appear when an application tries to communicate with a cooperating process that does not exist.
Restart the parent process so it can create the child processes again. If that does not help, this error could be the result of a programming error; contact the vendor or author of the program for an update.
A wait(2) system call was executed by a process that had no existing or unwaited-for child processes. The child processes could have exited prematurely, or might never have been created.
The symbolic name for this error is ECHILD, errno=10.