Chromecast app can't find my chrome cast?

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http://forums.androidcentral.com – Ok so when I turn my tv to the input that it's plugged into my tv says ready to cast so say I go into YouTube play a video then decide to go into the chrome cast app I downloaded through Google play it tries to search for chrome cast devices that are on my wifi network but it can never find it? Then I get a screen on my phone that says can't find any connected chromecasts on your networks even though I'm still able to cast things Sent from my SAMSUNG-SGH-I337 using AC Forums mobile app (HowTos)