Error Design Studio - I can not open the DB anymore

Question

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
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.
Log ID:
8f13d621-0fb0-4ce4-9ba0-e9a559973fe4
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.

Answer 1

I wrote the following code on start up and all the DS are set to load in script but it does not work - no ds is loaded
CROSSTAB_09.showLoadingState("loading...");
CROSSTAB_10.showLoadingState("loading...");
CROSSTAB_11.showLoadingState("loading...");
CROSSTAB_12.showLoadingState("loading...");
CROSSTAB_13.showLoadingState("loading...");
CROSSTAB_14.showLoadingState("loading...");
CROSSTAB_15.showLoadingState("loading...");
CROSSTAB_16.showLoadingState("loading...");
CROSSTAB_17.showLoadingState("loading...");
APPLICATION.doBackgroundProcessing();
//APPLICATION.doBackgroundProcessing();
if (DS_COUNTER == 1)
{CROSSTAB_09.hideLoadingState();DS_TABLE1.loadDataSource();}
else if
(DS_COUNTER == 2){CROSSTAB_10.hideLoadingState();DS_TABLE2.loadDataSource();}
else if
(DS_COUNTER == 3){CROSSTAB_11.hideLoadingState();DS_TABLE3.loadDataSource();}
else if
(DS_COUNTER == 4){CROSSTAB_12.hideLoadingState();DS_TABLE4.loadDataSource();}
else if
(DS_COUNTER == 5){CROSSTAB_13.hideLoadingState();DS_TABLE5.loadDataSource();}
else if
(DS_COUNTER == 6){CROSSTAB_14.hideLoadingState();DS_TABLE6.loadDataSource();}
else if
(DS_COUNTER == 7){CROSSTAB_15.hideLoadingState();DS_TABLE10.loadDataSource();}
else if
(DS_COUNTER == 8){CROSSTAB_16.hideLoadingState();DS_TABLE7.loadDataSource();}
else if
(DS_COUNTER == 9){CROSSTAB_17.hideLoadingState();DS_TABLE9.loadDataSource();}
if (DS_COUNTER < 9)
{DS_COUNTER = DS_COUNTER +1;
APPLICATION.doBackgroundProcessing();