Meaning of the error message "Assertion `isIndexedCHW(d)' failed"

Hi all,
I’m working on implementing plugin layers of SSD network on Tensor RT 2.1.
Now, I’m facing the problem that when I try to parse the SSD network on Caffe prototxt with plugin layers to Tensor RT engine. The binary dumps and shows such error message:

helpers.cpp:39: nvinfer1::DimsCHW nvinfer1::getCHW(const nvinfer1::Dims&): Assertion `isIndexedCHW(d)’ failed

I have read the post: . But it seems that that author’s problem differs from mine.

Could any one tell me the meaning of this error message, or give me some advises to solve this problems?