I was getting an error while clearing the cache because I added the following lines to the redis.conf file. I have now fixed this and successfully cleared the cache.
rename-command FLUSHDB ""
rename-command FLUSHALL ""
rename-command DEBUG ""
Now the only problem is when using the upload plugin, it gives the same "opss ...." error. I tried imgur and local in fof / upload plugin. The same error in both. Meanwhile, image optimization is on, but jpegoptim, optipng is installed on the server.
There is no record of today in the log records
Fof/ upload : 0.9.1