The operation add items to list cannot accept the arguments: [0] [1000]

[jfand72]

Hi, I am trying to construct a list with time values, but I received the error msg at runtime. 

I would appreciate a little help on this.

Thanks

[Taifun]

try to initalize the list using the create empty list block

• How to work with Lists by Saj
• How to work with Lists and Lists of lists (pdf) by appinventor.org

Taifun

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Trying to push the limits of App Inventor! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun. 

[jfand72]

Hi Taifun

I already did it, also using make a list block, with the same result :-(

[Taifun]

It would really help if you provided a screenshot of your relevant blocks, so we can see what you are trying to do, and where the problem may be.

[jfand72]

Hi Taifun

I already figured it out. Let me tell you that dealing with data files I/O in app inventor 2 is not straightforward at all. In my case, it did not work to convert immediately to csv (inside the timer block), instead of that I had to make my lists and post-process them in another block in order to save the data in a .txt file.  

Thank you 

[Taifun]

a screenshot could have helped us to give you some suggestions

 dealing with data files I/O in app inventor 2 is not straightforward at all. In my case, it did not work to convert immediately to csv (inside the timer block)

my guess is, you are reading a file using the file component. You should convert the text in the File.GotText event and not in a Clock.Timer event

Taifun

[jfand72]

Hi Taifun

I know you are very helpful, thanks anyway, I am sure I will need your help at some point in the future.