I am in the process of installing MySiteBuilder in our test environment before we deploy to production. I have an error after installation when I open the MSB site collection for the first time.
The error is:
“An error occurred during the processing of . The resource object with key 'delete_item_confirm' was not found.
Troubleshoot issues with Windows SharePoint Services. “
Solution
It seems that you don't have resources in the directory of the application. You must have forgotten to run "ststadm –o copyappbincontent" after MSB deployment.
Root 
MySiteBuilder installation and implementation
I am in the process of installing MySiteBuilder in our test environment before we deploy to production. I have an error after installation when I open the MSB site collection for the first time.