BEx error

Hai All,

I am trying to run a query and its giving me the following error as soon as I run the query.

<i>"<Internal error> receiving from BW server failed. BW server raised exception:SYSTEM_FAILURE. Do you want to see more information?"</i>

I click on yes. Then the following message comes up:

<i>"Field symbol not yet been assigned.

Error Group

RFC_ERROR_SYSTEM_FAILURE

Message

Field symbol has not yet been assigned."</i>

When click ok, then the following message shows up.

<i>"BW server we are connected to cannot refresh the query at sheet1!$A$3"</i>

When I click ok, the execel sheets gets closed.

Looks like this is a problem with service pack. Can anybody suggest me a solution for this problem?

Thanks.