Toad for oracle is not starting..

Well, recently toad is not answering , and I killed its process. But after that, whenever I want to start toad , I get this exception ;

Error reading TtdSQLRecall.HistorySQL: Stream read error

As usual, I googled it, but I could not find anything. As a solution, I have removed SavedSQL.dat file located "user files" directory under toad installation.. It worked for me, I hope it would solve your problem also..