Plugin could not be activated because it triggered a fatal error.

Hello,

I am facing difficulties network activating the Post-Indexer plugin as it always ends up as fatal error.

I have tried deactivating all plugins and activating only Post-Indexer still gives me the fatal error.

Also tried removing all other plugins except Post-Indexer and I am still getting the fatal error.

Removing and Re-installing the plugin also does not seem to resolve the fatal error I am facing.

Any help will be greatly appreciated.