While opening web ADI below issue may arise.
For resolving this issue follows below steps
Step - 1 : Go to excel and click on Office Button. Click on Excel Options
Step - 2: Go to Trust Centre Tab. Click on Trust Centre Settings
Step - 3: Go to Macro Settings Tab. Enable check box Trust Access to the VBA project object model
Step - 4: Click on ok
Step - 5: Click on ok
Step - 6: Restart the Machine and open the web ADI.