There was an error in callback

Problem Description:

When you search for user accounts using "Browse" People-Picker icon, the following error message may occur and the user accounts may not be resolved

Error Message:

"There was an error in callback".

Probable cause:

This issue normally happens if WSS_WPG group does not have any permissions on this registry key "HKEY_LOCAL_MACHINE\Software\Microsoft\Shared Tools\Web Server Extensions\14.0\Secure".

By default, WSS_WPG group has FULL control access to the above mentioned registry key.

This particular key contains a binary value called AppCredentialKey – it is used to encrypt/decrypt the data passed by PeoplePicker-SearchADForests. This key is created using setapppassword command and used in one way trust relationships. Application pool accounts need at least read access to the above mentioned registry key for successful People Picker behavior.

Resolution

1)      Check WSS_WPG group permissions and confirm whether the application pool account of the web application present in that group 

2)      Later check the registry key - "HKEY_LOCAL_MACHINE\Software\Microsoft\Shared Tools\Web Server Extensions\14.0\Secure" and identify permissions allocated for WSS_WPG group in the Permissions window of the registry key.

3)      If WSS_WPG group does not present in Permissions window, add the 'WSS_WPG' group with read or full control permissions.  

If you have any queries/questions regarding the above mentioned information then please let me know. I would be more than happy to help you as well as resolves your issues. Thank you.