[SOLVED]need help with some code

[swipis]

ok, I doing tutorial and now I got an error "attempt to index field 'context'(a nil value)" in Start function

here is the code

Script.itemSlots = 4 --int "Item Slots"
Script.itemSize = Vec2(64,64) --Vec2 "Item Size"
Script.offset = 8.0 --float "Offset"
Script.items = {}
Script.screenWidth = 0
function Script:Start()

self.screenWidth = App.context:GetWidth()

end
function Script:PostRender(context)
for i = 1, self.itemSlots, 1 do

context:SetColor(1,1,1,1)
local x = self.screenWidth - self.itemSize.x
local y = (i * self.itemSize.y) + (i * self.offset)
context:DrawRect(x, y, self.itemSize.x, self.itemSize.y)

end
end

 

please help

[AggrorJorn]

At the time of making these tutorials, you could retrieve the context from App. The standard main script has changed since then:

 

Replace

self.screenWidth = App.context:GetWidth()

 

You can also get the context like this:

self.screenWidth = Context:GetCurrent():GetWidth()

[swipis]

Thank you AggrorJorn for your tutorials and your answer!