The Log Manager uses an index file in each log file directory for quick access to log event data files. The Log Manager was unable to read from or write to the index file. This error can occur when the permissions for an index file are modified or because the file was removed.
Correct the error indicated in the message and view log events, export log events, or purge log events again. Make sure the user account that runs Informatica Services has read and write permission on the file.