Lookup Table - "Invalid Input"?

[mdelouker]

Hey guys, hope you are well. Sending this as I keep running into this error message stating "Invalid Input" when trying to input/output values using the Lookup Table function.

I've been searching/implementing solutions, but to no avail yet. Units of each should be fine as well, not too sure what the issue is. Any help would be greatly appreciated.

Attached are some images + the csv file for your reference.

Below is the formula as well and will attach the family as well in a separate reply below for your reference(s).
size_lookup(TB BKR Size, "MOP Scalar",1,MCA Scalar)

[mdelouker]

Here is the family:

[iainsavage]

First thing, your table is called breaker_lookup.csv.csv (that's not my typo).

In the TB BKR Size parameter its only called breaker_lookup.

I suggest that you correct that error first then see how it goes.