Is the MODIS MCD12Q1 data has changed the version?

Hello,everyone.I am a green hand of FEST-C,I followed the user guide and generated the scripts to generate the BLED4 data, I download the MODIS and NLCD data as the user guide said and changed the nlcd_modis_files_2011.txt to adapted with MODIS and NLCD data.But,when I run the scripts it gave the error message when opening the MODIS data.SO ,i am wondering that Is the MODIS MCD12Q1 data has changed the version or something?
Any messages will be helpful!
Thanks all!