Configuring LACP on an S3148P

I'm replacing an HP 2920-48G with LAG configured with a S3148p and I'm trying to LAG/LACP ports 1 and 2 of the S3148p to connect to a Dell S4048T-ON.

On an HP switch, which I'm familiar working with, creating a LAG is just a couple of mouse clicks. On the Dell S3148p, which I'm not familiar with, it's interesting. The Internet searches I've performed have been no help. I get some variation of these errors:

% Error: Gi 1/1 Port is part of a LAG.
% Error: Gi 1/2 Port is part of a LAG.
% Error: Port is not in Layer-2 mode Gi 1/1.
% Error: Port is not in Layer-2 mode Gi 1/2.
CMD-(CLI):[Error: Port is not in default mode Gi 1/1]by default from console
CMD-(CLI):[Error: Gi 1/1 Port is part of a non-default VLAN.]by default from console
CMD-(CLI):[Error: Port is not in default mode Gi 1/1]by default from console
CMD-(CLI):[Error: Port is not in Layer-2 mode Gi 1/2.]by default from console

Here is one of the many variations of commands I've tried:

{

s3148p#conf
s3148p(conf)#interface range gigabitethernet 1/1-1/2
s3148p(conf-if-range-gi-1/1-1/2)#portmode hybrid
s3148p(conf-if-range-gi-1/1-1/2)#switchport
s3148p(conf-if-range-gi-1/1-1/2)#port-channel-protocol lacp
% Error: Port is not in default mode Gi 1/1
% Error: Port is not in default mode Gi 1/2
s3148p(conf-if-range-gi-1/1-1/2)#exit
s3148p(conf)#interface gigabitethernet 1/1
s3148p(conf-if-gi-1/1)#port-channel-protocol lacp
% Error: Port is not in default mode Gi 1/1

}

Is there a s31xx specific guide other than the command guide which was no help that explains how to configure LAG/LACP on s31xxs switches?

Thank you!