The method '+' was called on null. Receiver: null Tried calling: +(6500) code example
Example: The method '[]' was called on null. Receiver: null Tried calling: [](0) flutter
The method '[]' was called on null.
Receiver: null
Tried calling: [](0)
The method '[]' was called on null.
Receiver: null
Tried calling: [](0)