Did you look at the "WriteMultipleVoltages" example from the TS library? Even if you solve your compile errors it wont work because TS limits updates to one every 15 seconds per channel so only the field 1 update will succeed.
Its possible you have the wrong board type set, can you compile and run any of the example programs that came with the library? I always find that getting the examples to run is a good way to ensure your environment is set up correctly.
Alternatively I note that the examples use "float" for the value but the error implies you supply "double" - perhaps this is tripping up the compiler?