Issue:- When I tried to open my Search administration Service application. I got the error message “The base ‘Microsoft.Office.Search.Internal.UI.SearchAdministration’ is not allowed for this age. The Type is not registered as safe.
Solution :- 1) Go to Central Administration website
2) Go to Site Settings.
3) Click “Reset to Site Definition”
4) Select the radio button “Reset all pages in the this site to definition version.”
Navdeep's Technology Space 
I truly appreciate this post. I have been looking all over for this! Thank goodness I found it on Bing. You’ve made my day! Thanks again
great post! loved it and will come back 🙂
Thanks for this post, you saved me from blunder 🙂