The operation + cannot accept the arguments: , [()], [0.15] Note: You will not see another error reported for 5 seconds

My app works this way. You have an initial screen with two lists, one for subjects and the other for the marks. In this first screen you will be adding your subjects and then with a button "add marks" you will go to another screen which as a spinner with the subjects you already put on the other screen. You choose your subject and then put the mark and the. This has to appear in the second list in the other screen, each mark with each subject.

I am having lots of problems trying to solve the list things any help?

Where in your blocks do you get the error ?

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When in the second screen I put the mark and the % and then click save the error appears

how can you add number to a list?

Your not found default for the marks list should be create empty list, not number 0.

but the list created is already an empty list no?

but he list created its already and empty list, i don't understand:(

Learn about using lists:

General Tutorials

Could you help me please!! I already seen this documents and I am not been able to solve this problem...


This should be create empty list