Adding "Vehicle Details" as a detail in "Accounts" section receiving communication not found error

Hi,

1.Created an object "Vehicle details" in my package "Vehicles" inheritance Account (base).

2. Created a detail using details wizard "vehicle details"

3. Added detail in Accounts Section under "Account Info" tab. Gave Detail Column "Owner" and  "Id" for object column. 

4.Created a detail page with a "Purchased from" lookup referencing to Accounts.

Getting following error message when trying to create a detail record:

Item with name "KumarVehicledetailsCommunication" not found.

I am doubting 3rd step. Can someone help me on this.

Thanks in advance.