When selecting Secure Copy | Logs and Reports, and error occurs: Error; "Unable to connect to database!"

One error screen will appear for each job log file that has already been written to the logging directory.
Each log file (.SCL file) created during a Secure Copy job is an independent database.
The directory assigned to collect the log files has become full.
Open Secure Copy | Tools menu | Preferences | Logging Settings
Navigate to the file path specified and delete files to create space in the logging sub directory.
If the log files are critical and cannot be lost, specify a new Logging file path to a share, or drive, or path where space is available.