Why this error is happening?

[picanastudios (George Abraham)]

[picanastudios (George Abraham)]

enru? What do you mean by that…

[iamwsumit (Sumit Kumar)]

I think you have initialised your variable to an empty string.
Initialise your list varaible to a empty list instead of a string.
Like this,

Instead of this

[picanastudios (George Abraham)]

i created empty list…

error is resolved now… on screeninitialize, i called list from tinydb and if value not there, it was set to empty string…instead of empty list… thanks

[Rogerio_Rios (Professional Support)]

So, the solution is posted above.
In POST 4 , @iamwsumit
Sorted out.

The operation add items to list cannot accept the arguments [*empty-string*], [Metro1]

response is a list and if the key “posts” was not found in the JSON string, then the text “not found” will be assigned to the global variable response, which results later in that error, because a text is not a list you might want to replace the text block “not found” by a create empty list block btw. a better name for the global variable response would be listResponse… [Unbenannt] EDIT: after looking again at your blocks, the error probably might occur somewhere else… how do you initialize …