Changed Selenium IDE source code format by following these steps:
Options>>Formats>>Python2/UT/RC>>Ok
 Format>>Python2/UT/RC
 Recorded code in IDE stop
Now playback button is not enabled. Try to export code to Python2/UT/RC to Eclipse(Python) enabled but there also it is not working, when trying to execute it is opening a box with "Ant" and close.
Please help.
Just you need to revert the steps to work.
Options>Formats>HTML
It should work.
Selenium IDE playback is not working