Whenever I try to switch the server to forge.jar the server will not start and says it crashes instantly. i switch to the regular version of 1.16 and the server loads and lets me try to connect. It shows that its an ‘Incompatible Vanilla server’. Then when I click connect it gives me the error “Incomplete set of tags received from server. Please contact server owner”
Try setting it to [Autoselect] and hit Download/Update, this should let AMP know to use that specific version of Forge.
(Really wish that the FTB download API actually provided proper version info)