Hi Manveen Dharni ,
* means the result is having multiple values . Try conditioning it as
IF (Condition Statement < 1) THEN 1 ELSE 0 END
In order to check whether your condition statement is working fine or not please create a calculated field and check whether you are getting desired result or not .
And yes ,please attach twbx file in case this will not work .
Please mark it right and helpful if this serves your purpose so that others can also get benefited & also to close the thread.