A cast is a programming "trick" which would allow a variable of type x to display a result of type y. They were very common in my c++ days (and probably still are for all I know but I don't work in c++ now)
For example, a cast would allow a variable of type int to display a char (or vice versa).
I can't answer your question fully because I don't yet know how (or if I am able) to use casts in SQL. There is no cast facility that I know of in Access (except perhaps to declare everthing as text). It does sound as though there is type-mismatching in one or other of your Access fields.
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