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Thank you again for your patience and assistance. And thanks for using salesforce.com! Error ID: 167646568-144760 (28981097)
I cannot understaand what the problem is - it was working good in the past, with no changes...

Hi Itai,Hi Kajal,Sorry for this issue you are encountering.This type of error indicates that an error has occurred that hasn't been trapped by the platform - a low-level java exception for example. If you need to move quicker than, start removing functionality from the component to isolate where the problem occurs and see if there are any other mechanisms you can use.If the problem continues may I suggest you please clear all the cookies and cache and log out of all accounts and log in once again which should resolve the issue. You can follow a support case by following these [1] directions:
For more information on the above error check with below link.
Hope this helps.Please mark this as solved if it's resolved so that it gets removed from the unanswered queue which results in helping others who are encountering a similar issue.Thanks,Nagendra