Help Marihuana System

[Killer...]

Hi everyone i have been scripting an Marihuana system for MTA Paradise, and show's me some errors.

These are the errors:

[2015-02-14 15:21:05] WARNING: drogas\s.lua:363: Bad argument @ 'setElementData' [Expected element at argument 1, got nil] 
[2015-02-14 15:21:05] ERROR: drogas\s.lua:364: call: failed to call 'players:takemaria' [string "?"] 
[2015-02-14 15:21:05] ERROR: drogas\s.lua:365: attempt to concatenate local 'pjid' (a boolean value) 

And this is the script for plant the marihuana:

function plantar ( thePlayer, command) 
        local maria = getElementData(thePlayer, "maria") 
        local pjid = exports.players:getCharacterID( source ) 
        local x,y,z = getElementPosition ( thePlayer ) 
        planta = createObject (3409, x, y, z) 
        if maria >= 2 then 
        if ( planta ) then -- if it was created 
        outputChatBox("((Has plantado una planta de marihuana))", source, 0, 0, 255 ) 
        setElementData ( source, "maria", maria ) 
        exports.players:takemaria( source, 2 ) 
        exports.sql:query_free('UPDATE characters SET maria = 5 WHERE characterID = '..pjid) 
        setTimer ( plantac, 1000, 1) 
        setTimer ( planta1, 2000, 1) 
        setTimer ( planta2, 4000, 1) 
        setTimer ( planta3, 6000, 1) 
        setTimer ( planta4, 10000, 1) 
        end 
        else 
        outputChatBox("((No tienes suficiente marihuana para poder plantar una planta de marihuana))", source, 0, 0, 255) 
end 
end 
addCommandHandler ( "plantar", plantar ) 

And on the script for take the marihuana:

[2015-02-14 15:28:46] WARNING: drogas\s.lua:380: Bad argument @ 'getObjectScale' [Expected object at argument 1, got nil] 
[2015-02-14 15:28:46] WARNING: drogas\s.lua:382: Bad argument @ 'getElementPosition' [Expected element at argument 1, got nil] 
[2015-02-14 15:28:46] WARNING: drogas\s.lua:383: Bad argument @ 'getElementPosition' [Expected element at argument 1, got boolean] 
[2015-02-14 15:28:46] WARNING: drogas\s.lua:384: Bad argument @ 'getDistanceBetweenPoints3D' [Expected vector3 at argument 1, got boolean] 
[2015-02-14 15:28:46] ERROR: drogas\s.lua:384: attempt to compare boolean with number 

And this is the script for take the marihuana:

function cosechar ( ) 
        local planta = getObjectScale ( planta ) 
        local pjid = exports.players:getCharacterID( source ) 
        local x,y,z = getElementPosition ( player ) 
        local cx,cy,cz = getElementPosition ( planta ) 
        if getDistanceBetweenPoints3D (x,y,z,cx,cy,cz) < 3 then 
        if getObjectScale ( planta, 1) then 
        destroyElement ( planta ) 
        outputChatBox("((Has cosechado 6 g de maria))", source, 255, 255, 0) 
        setElementData ( source, "maria", maria ) 
        exports.players:giveMaria(source, 6) 
        exports.sql:query_free('UPDATE characters SET maria = 5 WHERE characterID = '..pjid) 
        else  
            outputChatBox("((La planta es demasiado joven))", source, 255, 0, 0) 
        end 
    else 
    outputChatBox("((Tienes que acercarte a una planta para cosecharla))", source, 255, 0, 0) 
    end 
end 
  
addCommandHandler ("cosechar", cosechar) 

Please i need help, and thanks for your help.

[Tomas]

Is the resource 'players' started?

  
function plantar ( thePlayer, command) 
        local maria = getElementData(thePlayer, "maria") 
        local pjid = exports.players:getCharacterID( source ) 
        local x,y,z = getElementPosition ( thePlayer ) 
        planta = createObject (3409, x, y, z) 
        if maria >= 2 then 
        if ( planta ) then -- if it was created 
        outputChatBox("((Has plantado una planta de marihuana))", source, 0, 0, 255 ) 
        setElementData ( source, "maria", maria ) 
        exports.players:takemaria( source, 2 ) 
        exports.sql:query_free('UPDATE characters SET maria = 5 WHERE characterID = '..pjid) 
        setTimer ( plantac, 1000, 1) 
        setTimer ( planta1, 2000, 1) 
        setTimer ( planta2, 4000, 1) 
        setTimer ( planta3, 6000, 1) 
        setTimer ( planta4, 10000, 1) 
        end 
        else 
        outputChatBox("((No tienes suficiente marihuana para poder plantar una planta de marihuana))", source, 0, 0, 255) 
end 
end 
addCommandHandler ( "plantar", plantar ) 

Where is 'planta' defined here?

  
function cosechar ( ) 
        local planta = getObjectScale ( planta ) 
        local pjid = exports.players:getCharacterID( source ) 
        local x,y,z = getElementPosition ( player ) 
        local cx,cy,cz = getElementPosition ( planta ) 
        if getDistanceBetweenPoints3D (x,y,z,cx,cy,cz) < 3 then 
        if getObjectScale ( planta, 1) then 
        destroyElement ( planta ) 
        outputChatBox("((Has cosechado 6 g de maria))", source, 255, 255, 0) 
        setElementData ( source, "maria", maria ) 
        exports.players:giveMaria(source, 6) 
        exports.sql:query_free('UPDATE characters SET maria = 5 WHERE characterID = '..pjid) 
        else 
            outputChatBox("((La planta es demasiado joven))", source, 255, 0, 0) 
        end 
    else 
    outputChatBox("((Tienes que acercarte a una planta para cosecharla))", source, 255, 0, 0) 
    end 
end 
  
addCommandHandler ("cosechar", cosechar) 
  

Post the full code or it won't be easy.