Error 91: object variable or with block response not set

[Tabitha K.]

Good evening, lovely folk of the E-Prime group.

I am having some trouble with my experiment. I am programming a combined 
eye tracking + fMRI study in which participants do not make key press 
responses. The only allowable responses are 5 (from the scanner) or a (from 
the experimenter); otherwise, all screens are timed.

My script seems to compile successfully, but then I get the relatively 
useless error message "object variable or with block response not set." 
>From my internet searches thus far, I gather that it means that it has 
something to do with a conflict in the allowable responses to terminate a 
screen. As far as I can tell, though, I have my study set to only allow a 
keyboard response or no response. Any other ideas for things to try? I'm 
also happy to provide more information if needed - just not sure what would 
be useful at this point.

Thanks!
Tabitha

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