error while trying to expand table

[HavLaz]

hey guys, hope the salvation will come from here
i manage my work data base and today i got this error that keep me from accessing the data.
here is video of the problem, and an old backup (that's not up-to-date where it works fine)


can you help me what to do ?

the error i get is this:

"the expression is typed incorrectly, or it is too complex to be evaluated. For example, a numeric expression may contain too many complicated elements. Try simplifying the expression by assigning parts of the expression to variables. (Error 3071)"

[June7]

What is the expression? What changed? Is this a query error? Can you open in design view? Post the SQL statement.

I don't see an 'old backup' attached. Why not provide db with the error?

Video is less than helpful.