This operation is not supported by an unmodifiable list.
Source
void fillRange(int start, int end, [E fillValue]) {
throw new UnsupportedError(
"Cannot modify an unmodifiable list");
}
This operation is not supported by an unmodifiable list.
void fillRange(int start, int end, [E fillValue]) {
throw new UnsupportedError(
"Cannot modify an unmodifiable list");
}