Dart - x positional argument(s) expected, but 0 found.

The error "4 positional argument(s) expected, but 0 found." in Dart usually indicates that you are trying to call a function or constructor with the wrong number of arguments. This error occurs when the function or constructor is defined to take a certain number of arguments, but you are calling it with a different number of arguments.

To fix this error, you will need to make sure that you are passing the correct number of arguments when calling the function or constructor.

For example, if you are trying to call a function that takes four arguments and you are only providing three arguments, you will see this error:

void myFunction(int arg1, int arg2, int arg3, int arg4) {
  // function body

myFunction(1, 2, 3); // Error: 4 positional argument(s) expected, but 3 found.

To fix the error, you will need to provide all four arguments when calling the function:

myFunction(1, 2, 3, 4); // Correct: no error

Alternatively, you can use named arguments to specify which argument corresponds to which parameter:

myFunction(arg1: 1, arg2: 2, arg3: 3, arg4: 4); // Correct: no error

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