Problem: Unexpected error refreshing Server Manager Exception from HRESULT 0x800F0900 prompt when add or remove Server Manager Roles and Features.
This issue probably caused by corrupt Windows update. Follow below methods to troubleshoot the error.
Fix errors that are found in the CheckSUR.log
Step 1: Copy the package (.msu) to the %SYSTEMROOT%\CheckSUR\packages directory. By default, this directory doesn’t exist and you need to create the directory.
Step 2: Rerun the System Update Readiness Tool.