Symptoms

Most Universal Plugin Manager features such as upgrade checking and future compatibility test. are unusable The following line appears on top of the page,

Error encountered while retrieving saved configuration

as describe on this screenshot

 Diagnosis

Execute this SQL query and see if it return a result

SELECT * FROM BANDANA WHERE BANDANAKEY = 'com.atlassian.upm.ConfigurationStore:configuration:upm_configuration';

Resolution

If the above SQL query return any result, please proceed with the following steps

1. Create a database dump as a safety precaution

2. Execute the following SQL query:

   DELETE FROM BANDANA WHERE BANDANAKEY = 'com.atlassian.upm.ConfigurationStore:configuration:upm_configuration';

3. Access "Cache and Statistics" menu under your administration page
4. Click "Flush All"
5. See if the issue persist
6. If the issue persist, please shutdown and refresh plugin cache