Welcome to the PLCTalk community !
Do a Forum search on "Ken Roach MSG AC Drive Bad Idea Poor Practice Not Supported".
But I digress.
First verify that the drive is at the IP address you think it is, using PING or HTTP (type its address into a web browser).
Then verify that the drive is listening for EtherNet/IP messages. My favorite tool for that is Eli Fulkerson's TCPING. Port 44818 is EtherNet/IP, and Port 502 is Modbus/TCP. Check both to be sure your drive interface is set up for the protocol you think it is.
In ladder logic, trigger that MSG instruction just once, and look for an error code.
Posting screenshots (cropped and in PNG format please !) is also a helpful way to get the info involved in MSG instructions across to the readers.
Again, welcome to the Forum !