Error messages effecting coding

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

this is the most common error!

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

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