Field Loader and Fume Color

I am attempting to load Fume 3 color (3.5.3) using the Field Loader object but get the following error:

ERR: Throw location unknown (consider using BOOST_THROW_EXCEPTION)
ERR: Dynamic exception type: class boost::exception_detail::clone_impl<class boost::exception_detail::current_exception_std_exception_wrapper >
ERR: std::exception::what: channel_map.get_accessor: There is no channel named “Color”.
ERR: [struct boost::tag_original_exception_type * __ptr64] = class std::runtime_error

When using Field Magma and Input Field an almost identical error appears:

– Runtime error: channel_map.get_accessor: There is no channel named “Color”.

My Fume sim definitely does contain the color channel so something must be wrong…