Unable to delete the default fluid 'air'
 

I want to use water as a fluid and hence I tried deleting the default fluid air. Couldn't do it and got an error message which reads,

Error: delete-material: still in use by fluid. Error Object: air

Please help me delete it.

One of your domains still uses "air" as a fluid.
Change the domains fluid first.

Air was used as the fluid in cell zone condition. Changed it to water and got rid of it.

Thanks.