adcmctl.sh control script calls $FND_TOP/bin/FNDSVCRG executable. It is called before and after the script starts or stops the service. FNDSVCRG connects to the database using JDBC. It validates the configuration of the Seeded GSM Service.
First thing is make sure that the executable FNDSVRRG is there.
Do the listing for $FND_TOP/bin.
If managers fail to start then errors should appear in the log file.
Locate the log file and see if there is any message there.
If you cannot locate the Service Manager log file then there is a chance that the Service Managers are not starting properly. There could be a configuration issue that needs troubleshooting.
Was the service working properly before? What did you change before this error starts coming up?