The live video has ended because we have received the RTMP signal from your encoder to eliminate the transmission

does the stream stop shortly after starting? if yes, most likely you aren't following Facebook rules on stream settings, so they are effectively telling you to stop
 
38% frames is lost - your bandwidth is insufficient.
First use cable connection - to eliminate WiFi problems.
Second maybe 6000 kb/s is too much lower to 4500.
 
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