Can’t uninstall, nor re-install!

Hi all,

I have installed the plugin to try it out, then deactivated it to try an alternative. When I re-activated it, it didn’t work anymore, as in, the gallery pages were blank. I tried to uninstall it, but I get an error message. So I tried to install it again from scratch, and then again, I get an error message. I’d like to use it (possibly to purchase the pro version) but I am kinda stuck at the moment ??

Any help? Many thanks in advance!