Hello Michael,
1. Please check if Listener is Running and if you are able to connect to database.
2. As mentioned above, please check "trans.log" that will be created at same location where you execute the command "R3trans -d"
3. Please also Check Filesystem (specially Oraarch directory) and Tablespaces if they are not 100% occupied.
Hope this would help.
Thanks and Regards,
Rameez Sarang