I created a timer job which will send a mail to all the user.It was working fine in dev server.So ,I change the "SITE URL" in SOLUTION properties to prod server url(http://*_prod) and added solution by power shell and deployed it in prod using CA.It deployed with no issue but feature was not activated by default.
I tried to activate feature manually from "Site setting -- > site collection feature" but I received error saying "Unexpected error occurred".
I have "full control" on web application and scope of timer job is "Site".
Please guide me to move forward.