Big image to pyramid not reading .svs file?

Hello,

I downloaded some whole slide tissue data from TCGA which are in svs format. I want to use the Big image components to tile these images and run analysis on them in blocks. I got a small test set to work; however, when I began expanding my dataset I kept encountering an "Unsupported File Format error". All the files are .svs, I can view them in ScanScope and know they aren't corrupted. I have attached a file that does not work. Any suggestions/help/comments are greatly appreciated.

Thanks,
-Reid