When navigate to polls tool Exception is displayed.
It just happens if the database that is used is old and updated by upgrade scripts. There is a field that has to be clob that is a varchar. There wasn't a conversion script to make that conversion when the change came to the code.
It must be added to conversion scripts:
ALTER TABLE poll_poll ADD (tmpdetails CLOB);
UPDATE poll_poll SET tmpdetails=poll_details;
ALTER TABLE poll_poll DROP COLUMN poll_details;
ALTER TABLE poll_poll RENAME COLUMN tmpdetails TO poll_details;