Generate File in XLS Grid Module Shows Blank Page

I have searched high and low for an answer on this but cannot find one. I have set up a grid application that is set to open with a search and the search filter set to XLS. Running locally, it works perfectly - I can open to a date search filter, set the range and generate/download an excel file as desired. But when I migrate the app to production, all I get is a blank screen once I click to Generate File. I have had a similar issue with generating a PDF. Any idea what I need to change? I checked file permissions and set everything in the application folder to 777, but still no success.

Any suggestions would be greatly appreciated!

I did some more research and it may have to do with missing or disabled functions in my PHP installation. Does anyone know the best way I can go about updating/enabling them? I checked php -i and didn’t see them listed.