Here is an alternative group that should work the same way without causing the error.
Please edit your tree, and delete the group named: XBMC Payload Actions and then replace it with this one by copying and pasting the xml into your tree.
<?xml version="1.0" encoding="utf-16"?>
<!--VoxCommando 2.1.3.2-->
<commandGroup open="True" name="XBMC Payload Actions" enabled="True" prefix="" priority="0" requiredProcess="" description="">
<command id="365" name="Seek to {1}%" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="0" loopMax="0" description="">
<action>
<cmdType>XJson.Raw</cmdType>
<params>
<param>Player.GetActivePlayers</param>
</params>
<cmdRepeat>1</cmdRepeat>
</action>
<action>
<cmdType>Results.RegEx</cmdType>
<params>
<param>"playerid": (.*),</param>
</params>
<cmdRepeat>1</cmdRepeat>
</action>
<action>
<cmdType>XJson.Raw</cmdType>
<params>
<param>Player.Seek</param>
<param>"value":{1},"playerid":{Match.1}</param>
</params>
<cmdRepeat>1</cmdRepeat>
</action>
<phrase>seek</phrase>
<phrase optional="true">to</phrase>
<payloadList>0,5,10,20,30,40,50,60,70,80,90,99,100</payloadList>
<phrase optional="true">percent</phrase>
</command>
<command id="337" name="setvolume" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="" loopMax="" description="">
<action>
<cmdType>XJson.SetVol</cmdType>
<params>
<param>{1}</param>
</params>
<cmdRepeat>1</cmdRepeat>
</action>
<phrase>set volume</phrase>
<payloadList>5,10,15,20,30,40,50,60,70,80,90,100</payloadList>
</command>
<command id="429" name="zoom in/out n: {1} {2}" enabled="true" alwaysOn="False" confirm="False" requiredConfidence="0" loop="False" loopDelay="0" loopMax="0" description="">
<action>
<cmdType>XJson.Raw</cmdType>
<params>
<param>Input.ExecuteAction</param>
<param>"action":"zoom{1}"</param>
</params>
<cmdRepeat>{2}</cmdRepeat>
</action>
<phrase>Zoom</phrase>
<payloadList>in,out</payloadList>
<payloadList optional="true">1,2,3,4,5,10,20</payloadList>
</command>
</commandGroup>