RangeError on non list

[goblueaa]

I'm stumped on this error. Any thoughts?

` Future<void> fetchUsers() async {
    var data = await web3client.call(
Exception has occurred.
RangeError (RangeError: Value not in range: 32)
      contract: _deployedContract,
      function: _userCount,
      params: [],
    );`