Excel Importer module gives error when importing .xlsx file.

I read and applied all the solutions provided in the below forum links but it’s not working for me. https://community.mendix.com/link/questions/104656 https://community.mendix.com/link/questions/115898 https://community.mendix.com/link/questions/111786 https://community.mendix.com/link/questions/104737   Need urgent help on this please. I am using Studio version 9.10.0 and excel importer version 10.1.0    
1 answers

Null pointers means that an object can not be found. Did you make sure you uploaded an document? Note you have two steps. The first is creating a template based on a document or create your own template from scratch. The next step is uploading a document you want to import based on the template. Did you follow all the documentation steps?