Dear Team, I have Upgraded our sugar CRM 11.0.6 to 12.0.3 & we are Getting CRM after login screen ( HTTP: 500 Internal Server Error Invalid subscription json data ) Please help what can i do for this issue

I have an Use Case where : 1. There is one checkbox in Account Module which should get enable or visible only when : a. Account Inofrmation is saved successfully without any error and this account should have atleat one Address and atleast one case…