Well, first of all, your {exp:channel:entries}
tag has zero parameters, meaning you have little control over what's being loaded unless it is detecting it from the URL. I'm also guessing it's possible this Channel Entries loop lives inside of another one, which won't work. You'll have to provide significantly more information for us to give you a real answer...
But without more details, I'm going to guess you have a nested Channel Entries loop. Use an embed if you need to pull a different channel entry title in, or just use the {title}
tag if it's already in a loop.
If it isn't nested and you're not sure what's going on, try hard coding an entry_id
and test a few parameters to see if you get an output. Try these parameters on the tag:
{exp:channel:entries entry_id='1' dynamic='no' limit='1'}{title}{/exp:channel:entries}
Use a known entry_id
that has a status of open. See if that gets you somewhere.