Miracast receiver help

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http://forum.xda-developers.com – I have an android tv set top box, which has a program miracast receiver installed. My nexus 4 can get invited by the setop box and connect, but when running the miracast receiver program it trys to run and says: Please make sure the wifi-p2p is working and the WFD source is correct!. Any ideas? (HowTos)