This problem have been discussed about Ubuntu 16.04. Try navigating to /opt/manager-accounting in the terminal and once there do this: sudo ./manager-accounting. If this is your problem, then Manager will start. Close it and try to open it again without any command. If it works you will not have the problem again. It is something related to a file that Manager generate again during this process when you do the sudo ./manager-accounting in terminal. Please tell us if this solve your problem or how do you solve it finally for future reference or maybe for other people with the same issue. Good luck!
This is the post where @Gert explains this process: Manager does not start after recent update on Ubuntu - #34 by Gert