Why this error is happening?

enru? What do you mean by that…

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,

blocks (14)

Instead of this

blocks (15)

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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

So, the solution is posted above. :point_up::point_up::point_up:
In POST 4 , @Sumit1334
Sorted out.:+1:

:point_down::point_down::point_down::point_down::point_down:

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