Tvheadend

I'm trying to get player from /player.html and i'm getting a error while do trancoding from h264 to libx264

What i need to do ?

2018-04-04 13:42:18.360 subscription: 001B: "HTTP" unsubscribing from "XXX", hostname="XXX", username="XXX", client="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36" 
2018-04-04 13:42:18.361 libav: AVCodecContext: final ratefactor: 30.16
2018-04-04 13:42:18.421 mpegts: xxx inxxx - tuning on IPTV #1
2018-04-04 13:42:18.424 spawn: Executing "/usr/bin/ffmpeg" 
2018-04-04 13:42:18.424 subscription: 001C: "HTTP" subscribing on channel "xxx", weight: 100, adapter: "IPTV #1", network: "xxx", mux: xxx", provider: "FFmpeg", service: "RTSP server", profile="webtv-h264-aac-matroska", hostname="xxx", username="xxx", client="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36" 
2018-04-04 13:42:19.908 transcode: 001C: 01:H264: ==> Using profile webtv-h264
2018-04-04 13:42:19.928 libav: AVCodecContext: using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3
2018-04-04 13:42:19.932 libav: AVCodecContext: profile High, level 3.1
2018-04-04 13:42:19.933 libav: AVFilter: Invalid parameters provided.
2018-04-04 13:42:19.933 transcode: 001C: 01:H264: [h264 => libx264]: filters: failed to create 'in' filter