Hi @katharine,
I see you’ve also posted this elsewhere – please don’t post the same content multiple times; it clutters the forum.
@manimughal, OJS 3.2.x uses the exec PHP function to run commands on the server to unpack and install plugins. It sounds like your server’s administrator has disabled that function. The system will work, but you won’t be able to unpack/install plugins until the exec function is enabled again.
Regards,
Alec Smecher
Public Knowledge Project Team