Unhandled exception has occurred in your application.

Product:
Cognos Controller 10.2.1 Fix Pack 2
Microsoft Windows 2012 Server

Problem:
After installation of Cognos Controller 10.2.1 Fix Pack 2 on a existing Cognos Controller 10.2.1 installation, the FAP program give error when you login to the FAP client.

Because you have forgotten to upgrade the FAP database to the new version 9.
Error:
Microsoft NET Framework
Unhandled exception has occurred in your application.

Invalid Length for a Base-64 char array.

Solution:
1. Go to the Controller Configuration
2. Go to the Database settings
3. Create a new connection to the FAP database
4. Save and test it
5. Click on RUN to go to the DBCONV program
6. Select FAP
7. Click Connect
8. Click Upgrade
9. Click Close
Try again to start the Financial Analytics Publisher client and login.

More information
http://www-01.ibm.com/support/docview.wss?uid=swg21602419
http://www-01.ibm.com/support/knowledgecenter/SS9S6B_10.2.1/com.ibm.swg.ba.cognos.ctrl_inst.10.2.1.doc/c_win_ctrl_installfap.html%23win_ctrl_InstallFAP