Can you check is that your case:
602502-3 : Unable to view the SSL Cert list from the GUI
Component: TMOS
Symptoms:
When you try to see information about any SSL certificates in the GUI, it displays an error: An error has occurred while trying to process your request.
Conditions:
Can not view any SSL certificates in the GUI if at least one certificate has a double extension(like test.crt.crt) in its name.
Impact:
Unable to view the any SSL Cert from the GUI
Workaround:
Delete such certificate through TMSH and reimport without .crt extension in the certificate name.
delete sys file ssl-cert test.crt.crt