How to deal with a "type mismatch in expressions" in Microsoft Access?

I am trying to join two tables together (Client and Technician) but when I run the query it says "type mismatch in expressions" I can't figure it out and it says nothing in my textbook about it...any suggestions?
Update: Thanks :) I figured out what I did wrong literally the same time I got an answer from you that you answered my question. thanks :)
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