Circular Reference when using LOOKUP in DAX

Hi, I am trying to use something similar to a vlookup in dax and am not able to get it working..

I've attached an example workbook.

In table "Sheet1" I have got a column named "BucketID" which is generated from a formula (from dates being completed or not --- giving me a string of 1's and 0's...) -- I am trying to take that string of numbers, and look it up from table "BucketID" --- by looking up the tableID and then providing the corresponding text.... (this output/formula will be in column "Bucket"

can anyone help me?

link to the example file is here : https://1drv.ms/f/s!AjKuL-NFEjPStGN8rFzGGUA-M4Ia