rameshsr

When I run the command, lein run ./files/demo.xls ./files I am getting the following error. error :: Converting./files/demo.xlsxfailed with: java.lang.NullPointerException [demo.xlsx](https://github.com/mhaemmerle/excel-to-json/files/527335/demo.xlsx) [demo.xlsx](https://github.com/mhaemmerle/excel-to-json/files/527336/demo.xlsx) [#, #, #, #, #, #, #, #,...