Error messages effecting coding

[JamieK]

Hi,
Im wondering if anyone can help?

Im try to do an assignment and keep getting different error messages, participants are basically means to see a number say if its high or low using two keys, be shown their reaction time and then see a crosshair focal point and see another number and so on.

Can anyone spot what’s wrong with this?
I keep getting feedback is not defined and wait keys errors.

Any help is really appreciated thanks

[JamieK]

this is the most common error!

[Glen]

It looks to me like in the begin routine tab of the code type
feedback = " "
to define what feedback is to be.