[Serusers] The configuration file parse error when "socket=unix_socket" applied

Hi, there~: I've made a workable SER with the source code version 0.8.14. But while modifying the ser.cfg file, problem occurs. The default setting is : fifo="/tmp/ser_fifo" I commented this and add a line to change it into: #fifo="/tmp/ser_fifo" socket="/tmp/ser_socket" and problems occurred: # ser start 0(1987) parse error (25,1-7): parse error 0(1987) parse error (25,1-7): ERROR: bad config file (2 errors) Is this also a file format problem? Any suggestions would be appreciated.