Run object bad request

I am testing following code from the documentation. But no matter want operation I try, I got 400 bad request response for rm.run.do operation. The same operation works fine with flow.js
` var rm = new F.manager.RunManager({
run: {
account: ‘hangingsteel’,
project: ‘well-factory’,
model: ‘wellfactory.eqn’,
server: { host: ‘api.forio.com’ },
}
});

rm.getRun()
    .then(function(run) {
        rm.run.do('step(0)');
})`

{“status”:400,“errors”:{“status”:400,“errors”:null,“message”:“Invalid operation name.”,“runId”:“520b002a-23da-4b1e-88ba-282edef8a0f1”},“message”:“Bad Request.”}

I think you want run.do('step', 0) - see docs for do here. Is it documented as step(0) somewhere?

It works now : ) Thank you!