rsobj: serious error occured while reading history data

Hi Friends,

When I open the query in query designer or when i open the query in web application designer it shows the above mentioned error.

I tried to execute the prog RS_PERS_ACTIVATE to activate history data, it shows the 'Activation of history failed'.

The web appln designer doesn't get activated due to this.

How to proceed further.

Thanks in advance.

Regards,

Prabhu