Error Design Studio - I can not open the DB anymore

Dear All

I am facing a big issue with Design Studio

I was working on a DB and suddenly I can not see it .

I can open it and see outline , DSs properties but I can not see the preview . I get the error below.

I have no idea what happens - I get no error script problem in the DB - I dunno what it is wrong with it.

I have tried to open the RSTT trace but I see no trace  with LOC_000001.

Thanks in advance for your help . I will appreciate that

regeards

Manu

ERROR

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Termination message sent INFO Recording RSTT trace with ID "LOC_000001"... com.sap.ip.bi.base.appli [...]

While processing the current request, an exception occurred which could not be handled by the application or the framework.

Failed to process request. Please contact your system administrator.

To facilitate analysis of the problem, keep a copy of this error page.

We are sorry for the inconvenience.

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