Server Error in '/' Application Runtime Error

Hello,

I created a master list of safety data sheets for my work and a QR code to access them all. The code brings you to a table of contents, and then you can click on each individual chemical that then brings you to its specific SDS. All was working well up until now, when clicking on a specific chemical, I am getting the "Server Error in '/' Application Runtime Error" message. The QR code still brings you to the table of contents but no further than that. 

All of the other QR codes that I created are working the same way as the master list should and even the links for specific chemicals are working too. Is my file size just too big for the master list? I am at a loss as IT doesnt seem to know whats going on either. 

If anyone has any ideas, please share.

Thank you