F1008 09:26:58.039983 13233 layer.hpp:367] Check failed: ExactNumTopBlobs() == top.size() (2 vs. 1)

[l1uw3n]

F1008 09:26:58.039983 13233 layer.hpp:367] Check failed: ExactNumTopBlobs() == top.size() (2 vs. 1) VideoData Layer produces 2 top blob(s) as output.
*** Check failure stack trace: ***
@ 0x7f4f411f45b4 google::LogMessage::Fail()
@ 0x7f4f411f4510 google::LogMessage::SendToLog()
@ 0x7f4f411f3e8e google::LogMessage::Flush()
@ 0x7f4f411f73af google::LogMessageFatal::~LogMessageFatal()
@ 0x7f4f4417c609 caffe::Layer<>::CheckBlobCounts()
@ 0x7f4f442ad1f0 caffe::Net<>::Init()
@ 0x7f4f442afa1a caffe::Net<>::Net()
@ 0x40f068 Classifier::Classifier()
@ 0x410981 main
@ 0x7f4f4061ec05 __libc_start_main
@ 0x40eea9 (unknown)
@ (nil) (unknown)

[showgood163]

I met this problem when I try to use caffe.layers.VideoData().
The problem here is that caffe.layers.VideoData() only return 1 Top object instead of 2 Top objects.
I dont know how to solve it for now and have spent much time on this since I dont know what to do.
@dutran can you shed a light on this problem?