Plugin Activation Caused 500 (internal server error)

Hi. Thank you for creating the plugin. I can install it OK, but when I go to activate it, the system crashes and throws a 500 Internal Server Error. There are no other plugins active on the site.

I tried it twice and both times it crashed – each time I have to SSH to the server and rename the plugin, then I could access the site again.

Any ideas?

Thanks

Mike