ADManager Plus Service not start - Error 1067

ADManager Plus Service not start - Error 1067

We have ADManager Plus 4.0.0 installed and working fine but recently the service is not starting. When trying to start the service manually, it got error message of "Windows could not start the ADManager Plus service on Local Computer. Error 1067: The process terminated unexpectedly." Could you please assist? Thanks.
                New to ADManager Plus?

                  New to ADSelfService Plus?