We use slf4j in our application code with log4j v1 as the underlying logging implementation. This version of log4j is unsupported.
Switch to Log4j 2.15.0 (requires migrating the log4j.properties to XML) and update dependencies so that log4j v2 is the underlying implementation for other loggers:
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information