How to identify file for "The system cannot find the file specified." during a pg_ctl -D start?

I'm getting one message during pg_ctl -D start of the standby server. Perhaps more of a general troubleshooting question. This is what I'm seeing when I do a pg_ctl -D start: D:\>pg_ctl -D d:\dev_data_standby start server starting D:\>2016-03-21 08:41:12 EDT 1016 LOG: loaded library "auto_explain" 1 file(s) copied. The system cannot find the file specified. The log file shows: 2016-03-21 08:41:12 EDT 3564 LOG: database system was interrupted; last known up at 2016-03-21 08:38:08 EDT 2016-03-21 08:41:16 EDT 3564 LOG: entering standby mode 2016-03-21 08:41:16 EDT 3564 LOG: restored log file "0000000100000002000000F2" from archive 2016-03-21 08:41:16 EDT 3564 LOG: redo starts at 2/F2000020 2016-03-21 08:41:16 EDT 3564 LOG: consistent recovery state reached at 2/F20000E0 2016-03-21 08:41:16 EDT 3816 LOG: streaming replication successfully connected to primary How can I troubleshoot that error: The system cannot find the file specified.?