Hi, l have been working on "Platform App Builder Certification Maintenance (Winter '21) Get Hands-on With Flow Before-Save Trigger When Certain Record Changes are Made" part and it gives me 
" Whoops, looks like there was a problem. Please try again." error message many times although l tried on new and old sandbox.  Both didnt work. Can somebody help me about it ? thanks in advance. it is important to keep my certification. 

Hi, l have been working on "Platform App Builder Certification Maintenance (Winter '21) Get Hands-on With Flow Before-Save Trigger When Certain Record Changes are Made" part and it gives me 
" Whoops, looks like there was a problem. Please try again." error message many times although l tried on new and old sandbox.  Both didnt work. Can somebody help me about it ? thanks in advance. it is important to keep my certification.