Error full text indexing document NT000008F6

HiI am getting the following error on my server

05/14/2005 07:07:25 PM Error full text indexing document NT000008F6 d:\Lotus\Domino\Data\mtdata\mtstore.ft (rc=3892) Not enough memory for Full Text Indexing or Search

05/14/2005 07:07:27 PM Full Text message: Memory allocation error. errcode = 520

05/14/2005 07:07:27 PM Error full text indexing document NT000008F6 d:\Lotus\Domino\Data\mtdata\mtstore.ft (rc=3892) Not enough memory for Full Text Indexing or Search

What type of error is this ,and how can i resolve this.

I am sorry I am not a Lotus Admin,but some how i am handling it.

Thanks

Note:still the server is on version 5