Please Help Me about BEx!

Hello!Today I meet a problem about the BEx.I have create a cube in the netweaver2004s and the fact table's data is correct,so i want to create a query in the BEx explore.But when i exec the query,the system return a message:

<Internal error> Receiving from BW Server failed.

BW Server raised exception:SYSTEM_FAILURE.

Do you want see more infomation?

The Detail is :

Error Group

RFC_ERROR_SYSTEM_FAILURE

Message

syntax error in program GP7AQSP73X2SDVACJHVVKA7J5ET

What the problem is? And How to deal with it?

Please help me,thank you!