RTMPDUMP error with RTMP_ReadPacket, failed to read RTMP packet header

[steve2025]

I'm trying to stream download this but it ends up with error.
Does anyone has any idea? I try to disassembler the swf but can;t find any useful information

C:\CLT\rtmpdump>rtmpdump -r "rtmp://vod4nl.webvideocore.net:1935/pull" -a "pull"
-f "WIN 14,0,0,145" -W "http://play.webvideocore.net/player3.swf" -p "Videos_files/widget35_markup.html" -y "f_d326790246307196
f8653adad7d69675.flv" -o "2014-08-12_10-25-26_f_d326790246307196f8653adad7d69675
.flv"
RTMPDump v2.4 GIT-2013-12-05 (Compiled by KSV)
(c) 2010 Andrej Stepanchuk, Howard Chu, The Flvstreamer Team; license: GPL
Connecting ...
INFO: Connected...
Starting download at: 0.000 kB
87.067 kB / 9.04 sec
ERROR: RTMP_ReadPacket, failed to read RTMP packet header
106.570 kB / 9.12 sec
Download complete