I am using sharepoint 2019 on prem
I have created group and assign contribute permission to it,
I am using application page where i have put custom web part to allow user's to upload documents on document library.
as user login , he/she gets white page with progress image ( circle ), user can goto viewlsts.aspx and sitesettng.aspx using url but unable to view webparrt which is placed on application page ( its landing page )
What to do to solve this issue, user login to portal to find out landing page ( applicaion page with custom web part )
Note: I have not stopped/broken inherited permission..
What I have tried:
assigned permission to group to login, but hard luck as white screens comes up