I am running HTK_Compile_Model.sh and getting the following error message. 

        Step 4 - Creating Transcription Files
==============================================================
writing to mlf file ./interim_files/words.mlf
writing to ./interim_files/words.mlf file done

        Step 5 - Coding the (Audio) Data
==============================================================
  ERROR [+6210]  OpenWaveInput: Cannot open waveform file ../train/wav/sample1.w
av
 FATAL ERROR - Terminating program C:\cygwin\HTK\htk-3.3-windows-binary\htk\HCop
y.exe

I have checked the directories and the code, but can't figure out where I am going wrong.  Can anyone give me some pointers? 

Much appreciated