removing shared users on forms and views

Hi Support Team,

I having issues with my application. I added some users (their gmail id is recognized by zoho and has application in their accounts ) and its been added successfully but when i tried to access the application, then it says
1. no access to this application
2. i tried to remove the user it says
a. 12301 unknown object
b. 301 object removed
and gets back to me the application again.

any idea ?

Thanks,