NoSuchTrialException Error

[kogrob]

Hello!

I'd consider myself to be relatively new to Unity and C#, so I apologize in advance if this is a basic coding issue.

I've been following along with the full tutorial and applying it to my own experiment, but for some reason, I can't get my experiment to start at all. The program loads, but before I click "start," I get the "There is no trial zero" error. Once I click "start," I then get the "There is no next trial" error. I've tried setting the number of trials as a set value within my code, as well as via my json settings file. Do you know of any possible situations that might be throwing this error? I didn't have this issue with other experimental setups, although I was able to run my experiments despite having the "there is no trial zero error."

Thanks!

[jackbrookes]

This would trigger if you try to start the next trial e.g. with BeginNextTrial() before you have generated your trials. Or, maybe you are trying to access session.CurrentTrial before you have actually started a trial. Perhaps show a screenshot of the items in the events of On Session Begin?

[kogrob]

Here's a screenshot of the items that I have in On Session Begin
I eventually was able to get my experiment to run, but I'm still getting the NoSuchTrialException error. What ended up fixing things more or less was removing any instances of session.CurrentTrial.result[""] from my experiment generator class. One of my classes ends up having to access session.CurrentTrial to record some data, so the error is coming from that script. Do you have any suggestions on how I could ensure that all the trials are generated first before this class runs? Would I have to use a coroutine for this?

[jackbrookes]

See, you are running BeginNextTrial before Generate. These events run from top to bottom. Reorder them, putting BeginNextTrial at the bottom by grabbing them with the drag texture on the left side. Hope that helps!?

The "There is no trial zero" error before you click start must be a different issue. It might relate to something in your scene trying to start or end the trial, before anything has been set up. You can do things like wrap your code in conditionals:

    if (session.InTrial) // check if we are in a trial before we try to end it
    {
        session.CurrentTrial.result["something"] = 123;
        session.EndCurrentTrial();
    }