I could manage to resolve this issue but not one more problem is that. I am getting an error:
Total Warnings: 1
Total Errors: 10
***> One or more problems was encountered while running the pre-flight check…
Check your configuration file(s) to ensure that they contain valid
directives and data defintions. If you are upgrading from a previous
version of Nagios, you should be aware that some variables/definitions
may have been removed or modified in this version. Make sure to read
the HTML documentation regarding the config files, as well as the
'Whats New' section to find out what has changed.
Will you let me know where should I check for it?