Code:
19:48:02.982: [rtmp stream: 'simple_stream'] Connecting to RTMP URL rtmp://live-arn.twitch.tv/app...
19:48:03.052: [rtmp stream: 'simple_stream'] Interface: Killer Wireless-n/a/ac 1535 Wireless Network Adapter (802.11, 144 mbps)
19:48:05.309: [rtmp stream: 'simple_stream'] Connection to rtmp://live-arn.twitch.tv/app successful
19:48:05.317: ==== Streaming Start ===============================================
...
19:49:22.967: [rtmp stream: 'simple_stream'] User stopped the stream
19:49:22.968: Output 'simple_stream': stopping
19:49:22.968: Output 'simple_stream': Total encoded frames: 2399
19:49:22.968: Output 'simple_stream': Total drawn frames: 2399
19:49:22.968: Output 'simple_stream': Number of lagged frames due to rendering lag/stalls: 31 (1.3%)
19:49:22.968: Output 'simple_stream': Number of dropped frames due to insufficient bandwidth/connection stalls: 1848 (77.0%)
Your connection is too unstable to stream, and you're trying to stream from a wireless card. A Killer wireless card, no less. Try installed the drivers only package and remove their network configuration utility if it is installed.