Whenever the drum is empty I get this error...

Whenever the drum is empty I get this error, if anyone can help it would be much appreciated .

Error: http://gyazo.com/035286dcd63640bec4a5eb10b7903184

He is a link to my code: http://pastebin.com/TKpi0b1i

Moved to Ask a Pro.

Err, did you look at line 43?


When the drum is empty contents will be nil, because there is no contents

Its a simple fix really:

	local tankInfo = con[2].getTankInfo()
	local contents = tankInfo[1].contents
	local amount = contents.amount
	samount = tostring(amount)
	scap = "256000"

	if samount == nil then
	  samount = "0"
	end

Change this to:

	local tankInfo = con[2].getTankInfo()
	local contents = tankInfo[1].contents
	local amount = 0
	if contents then
	  amount = contents.amount
	end
	samount = tostring(amount)

	if samount == nil then
	  samount = "0"
	end

I think there is one other place you reference 'contents.amount', you'll need to change that as well.

when the drum is empty the variable contents in nil, check that it is not nil before using it

:ph34r:/>

In HPWebcamAble's solution you don't need to convert it to a string

my version of the solution:

local tankInfo = con[2].getTankInfo()
local contents = tankInfo[1].contents
local amount = 0
if contents then
  amount = contents.amount
else
  amount = "0"
end

Well that fixed it but now i have this error: http://gyazo.com/bc19ba5764e3cdb7d415dfd4411df0a4

@itsogman, on 17 July 2015 - 07:07 PM said:

Well that fixed it but now i have this error: http://gyazo.com/bc1...415dfd4411df0a4

With you new line 25 being?

@itsogman, on 17 July 2015 - 07:07 PM said:

Well that fixed it but now i have this error: http://gyazo.com/bc1...415dfd4411df0a4

Again, you are accessing contents, so you need to check if it is nil:

function fluidDisplay()
  local tankInfo = con[2].getTankInfo()
  local contents = tankInfo[1].contents
  local name = contents.rawName        --# Check if 'contents' is nil BEFORE this
  local maxF = "256000"
  addText(11,57,name,0xFF0000,1)
end

flaghacker, on 17 July 2015 - 07:58 PM said:

With you new line 25 being?

Err… What?

HPWebcamAble, on 17 July 2015 - 08:13 PM said:

flaghacker, on 17 July 2015 - 07:58 PM said:

With you new line 25 being?

Err… What?

Line 25 on his pastebin:

local maxF = "256000"

That can't throw any errors…

flaghacker, on 17 July 2015 - 08:51 PM said:

Line 25 on his pastebin:

local maxF = "256000"

That can't throw any errors…

Ohh, that makes sense. I'm still not sure what you said, but oh well.

That's what I was thinking, and I assumed it was the line above it (like I pointed out above)

@itsogman, on 17 July 2015 - 07:07 PM said:

Well that fixed it but now i have this error: http://gyazo.com/bc1...415dfd4411df0a4

Can you post the updated code?