Thanks for the fast answer - I verified the Excel file multiple times, it had 36 conditions (must have been some extra blank rows that I could not delete).
I created another Excel file and it worked.
I left the code with reps==1 because I want to have one repetition of the trial.
Follow up question (independent of initial one and not sure if should ask in the same post):
How to introduce a component where the subjects needs to input text (as a response) that will generate the next window after the user presses “Enter”.
Text component asking: “Type a few words on something”
Textbox component that is editable: “Something something” (typed by user).
After pressing Enter in the Textbox component, the new routine is activated from the trial.
You can have an editable text box to capture the participant’s input and end the trial on ‘enter’ if you have a keyboard component monitoring for 'return' (set to end the routine) above the editable text component.