I think roll20 may have made some change to the VTT or API handling? Not sure. Just a quick observation of the FFG Star Wars sheet (API- compatible) ; These three lines have not changed on the sheet in 10 years according to github file history; <input name="attr_encumbrance_max" type="number" min="1" value="1" />
<input name="attr_encumbrancemax" type="hidden" value="@{encumbrance|max}" disabled />
<input name="attr_encumbrance" type="number" min="0" value="0" /><br /> Many of the rolls on the sheet (also not changed in many years) include "encumbrancemax" like so; <button type='roll' name='roll_Athletics' value='!eed characterID(@{character_id}) label(skill:Athletics) @{diceAthletics} encum(@{encumbrancemax}|@{encumbrance}) skill(@{rankAthletics}|@{brawn}|Athletics) @{dicePool} (gmdice)'></button> I was able to simply add "encumbrancemax" value="1" on the Attributes tab and no longer get the error in chat. BUT, I have no idea how the sheet and/or the dice roller mod uses "encumbrancemax" though. Might send a DM to the listed sheet author Tim P. and see if they could take a look. Cheers