Cannot add dissector to Wireshark on OSX. 

I have installed wireshark via  homebrew  and add the ethereum.lua script as a plugin. I have then reloaded the plug in. Wireshark however fails to recognise it.; I will appreciate any assitance with this.

Wireshark version: Wireshark 3.0.6 (v3.0.6-0-g908c8e357d0f)

OSX details:   
System Version: macOS 10.14.6 (18G103)
 Kernel Version: Darwin 18.