Two things: 1) A token must be selected as the error message shows. 2) --ids is not a valid Spawn command. You are probably thinking of TokenMod. If you want to override the default Spawn destination (selected) to a target token, use the command below. A button will show up in chat that you click to initiate targeting. Spawned tokens will appear using these point(s) as origins, respecting the offsets provided. --targets|<#> Spawn was written before there were other workarounds for overcoming the Roll20 api bug of not "remembering" ids of both @{selected} and @{target} designators, so this chat button method was created.