Fatal error unknown:

Every time i activate this plugin i receive this error “Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0” on my homepage i am not 100% sure if it is the plugin or of its conflicting or is something on the server? any input on this would be helpful!

Thank you.

https://ww.wp.xz.cn/plugins/wp-optimize-speed-by-xtraffic/