How to execute steps or script when test steps fails?

Hi,

Just a note to make sure you understand the difference between OnLogError event suggested by rraghvani and try/catch/finally code mentioned by tristaanogre :

-- OnLogError will handle 'logical' script problems, for example, the click on the object that has zero size;

-- try/catch/finally will handle runtime exceptions, like an attempt to use null object or divide by zero.

Beyond the event handlers that rraghvani suggests, you could also go the route of using try/catch/finally code.  This is available both in keyword tests and in script code (depending upon your script language).  This will allow you to execute code on exceptions as well as a "finally" block to execute at the end of every test case.