Hi Goutham,
this is a very general Error Message which only says that something is wrong with the Fulltext Server Service. You can find the detailed exception in the corresponding Log File on your DocuWare Server.
Usually the file you need for this Message is the PlatformLog and/or the FulltextLog located in C:\ProgramData\DocuWare\Logs
.
With the log messages you should be able to figure out the problem or post it here again so we can hint you in the correct direction.
Greetings from Germany,
Simon H. Hellmann
DocuWare System Consultant