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

[ben robinson]

When it crashes, giving you the above error message, it probably
leaves your cursor blinking on the line of code where the program
crashed. Take a look at what is written on that line of code. Maybe it
refers to some object which you once had in your program but have
since deleted? Or an Attribute (column name) in a List which you've
mistyped or forgot to create? Something along those lines would be my
first guess. Take another look at the line of code where the program
crashes.

ben

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[David McFarlane]

See also http://www.pstnet.com/support/kb.asp?TopicID=4782 . Example
code there will compile, but when run will crash at the line "y = x.RESP".

-- David McFarlane