C5W3 - [SOLVED] "Spectrogram is wrong. Check the parameters passed to the insert_audio_clip function"

All mu code till that points works great all unit test passed.
but i keep getting this assertion. any help ?

I found the issue. i forgot to append to previous segments in the function insert_audio_clip.
note that the code pass the unit test. maybe it should be wise to incorporate such a check.

Thanks for your report, I’ll contact the course staff about it.

I am stuck on this step as well. I don’t see any list that is collecting the previous segment_times and don’t see any instructions on where that will be used. Any pointers?