More information about failed command execution in server log

Any exit code that is different from 0 is considered as execution failure.

Contents of standard error and standard output for failed executions (if any).
"Process exited with code: N." (for empty output, and exit code not equal to 0).
"Process killed by signal: N." (for process terminated by a signal, on Linux only).
"Process terminated unexpectedly." (for process terminated for unknown reasons).

Process exited with code: 1.