TREX error Index category could not be created: Exception 8,Error

Hi,

I am geting the error  while creating the index on TREX 6.1. In t-code SKPR07 I have check the application log and got the following error and I am not able to create the index. Moreover I have check all setting as per installation document its looking fine. Please help me.

<b>error:-

Index category could not be created: Exception  8, Error

Message no. INDEXING015

Diagnosis

An error occurred when a new index category was generated using the

function module SRET_IDXCAT_CREATE.</b>

Thanks,

Harshal