When we are done with all Oracle12c installation and just to go for EM express,you may face the following error in FireFox browser.
This error occur in case you have miss used values of memory_target and memory_max_target.
To overcome the same follow the following steps
If you want to change the several materials old material group to new material group then follow the following steps :-
Step 1. Find all the materials with old material group either from MM60 or SE16(MARA table)