void replaceRange(
int start,
int end,
Iterable<E> iterable
)

This operation is not supported by an unmodifiable list.

Source

/** This operation is not supported by an unmodifiable list. */
void replaceRange(int start, int end, Iterable<E> iterable) {
  throw new UnsupportedError(
      "Cannot remove from an unmodifiable list");
}