Lightburn 1.4.01says waiting for connect

If the homing cycle is not available in your GRBL settings, then the error message is generated by an incorrect setting in Device Settings.

Click Edit, click Device Settings, turn off the Auto-home on startup switch.
It’s the top of the list of ‘Other Options’. Click OK to close the window and allow the setting change.

Waiting for Connection is a normal message to get before you connect.
You would not have gotten Error 5 unless you were connected.

Please test and verify that it’s working properly after the change to Device Settings.