What is wrong with this bar chart?

Dear Campers,

I am working on Data visualization certificate but my chart has failed to pass test 10. I have read about a similar issue Here which suggests a particular way of solving the problem for the test to pass i.e. using time scale. I suppose the same problem can also be solved using bandscale which is what i am using. The error message i keep getting doesn’t even make sense to me because the bars and the axis calibration are perfectly aligned.

10. The data-date attribute and its corresponding bar element should align with the corresponding value on the x-axis.

Can someone take a look at it. Probably there is something i have missed.
Bar Chart Link