I'm sorry to hear that you're experiencing problems with your plugin. On which address did you mail us? I cannot recall receiving any support emails on this matter.
First of all, if you can't login at all anymore, just rename the plugin in your plugin directory. Wordpress then won't load the plugin and you'll be able to login again.
Regarding this error, did you configure at least one social network at your application @ https://account.react.com/ ?