Assertion '!' failed while the inference of Faster R-CNN using tensorRT2.0 on TX2

while i am trying inference of faster R-CNN using tensorRT2.0 on jetson TX2,i met this error

./deviceQuerysample_fasterRCNN: sampleFasterRCNN.cpp:121: void writePPMFileWithBBox(const string&, PPM, BBox): Assertion `!’ failed.
Aborted (core dumped)

can anyone help me in it?
thanks in advance

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Can you make sure that your running this on a platform where you have write privileges, it looks like the output file cannot be written to the device.