The operation length of list cannot accept the arguments: , [""]

[drdoof]

Hi,
I got this error when I open my app. This block is in screen1.initialize block

I understand that "get start value" list is empty when beginning but I don't understand why is this cause an error? I put "logic and" block to check if its empty or not.
Thanks in advance.

Solution: length of list function does not accept empty start value so I put this block inside another if block as in photo:

(deleted unnecessary things in photo for not to confuse you.)

[RamNaresh]

Would be great if you can show the blocks where you are calling new screen with start value.

[RamNaresh]

OR you can share the Do It result for the get start value block, smthing this way

[RamNaresh]

Tried to reproduce, could be the reason behind the error

Screen1:

Screen2:

If it is then, you need to correct the screen calling with perfect argument(s)

[drdoof]

of course, if it helps to you here is an example photo where first argument (1) represents no failure for my app, second and third ones are variables.

[RamNaresh]

I need to work with assumptions and possible input, what I suggest to Do It over make a list block, what list, it is trying to make, whihc is to be forworded to next screen.

Live Development, Testing and Debugging

[drdoof]

here is do it result of make a list block. Already solved the problem but thank you for your help

[RamNaresh]

@drdoof

Already solved the problem

What was the solution, please share with us, to help others to know and solve the similar issue. Thanks

[drdoof]

I shared it with editing my first message and add it to "Solution" part

[dora_paz]

Another way it would be to check if list / start value is empty

[drdoof]

Thanks, this seems more logical. I totally forgot "is list empty" block.

[RamNaresh]

And one more level can be added to check weather it is a list ot not,

Else this could also result into