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You have encountered an unexpected error. Please contact your System Administrator for assistance.

How to I implement the following recommended Solution?

Solution:

 
Updating Application tables from sqlplus/toad is not supported. 
For the user(s) effected with the error, the following SQL can be run to update the missing value causing the java.lang.NullPointerException:

SQL> update FND_USER_PREFERENCES set PREFERENCE_VALUE='NtfSubject,' where USER_NAME='<username>' and PREFERENCE_NAME='ADVANCED_WL_SORT_PREF';
SQL> commit;

Replace '<username>' with the actual username in the FND_USER table.